Add missing header files throughout the testsuite.

* crypt/md5.h: Test _LIBC with #if defined, not #if.
	* dirent/opendir-tst1.c: Include sys/stat.h.
	* dirent/tst-fdopendir.c: Include sys/stat.h.
	* dirent/tst-fdopendir2.c: Include stdlib.h.
	* dirent/tst-scandir.c: Include stdbool.h.
	* elf/tst-auditmod1.c: Include link.h and stddef.h.
	* elf/tst-tls15.c: Include stdlib.h.
	* elf/tst-tls16.c: Include stdlib.h.
	* elf/tst-tls17.c: Include stdlib.h.
	* elf/tst-tls18.c: Include stdlib.h.
	* iconv/tst-iconv6.c: Include endian.h.
	* iconvdata/bug-iconv11.c: Include limits.h.
	* io/test-utime.c: Include stdint.h.
	* io/tst-faccessat.c: Include sys/stat.h.
	* io/tst-fchmodat.c: Include sys/stat.h.
	* io/tst-fchownat.c: Include sys/stat.h.
	* io/tst-fstatat.c: Include sys/stat.h.
	* io/tst-futimesat.c: Include sys/stat.h.
	* io/tst-linkat.c: Include sys/stat.h.
	* io/tst-mkdirat.c: Include sys/stat.h and stdbool.h.
	* io/tst-mkfifoat.c: Include sys/stat.h and stdbool.h.
	* io/tst-mknodat.c: Include sys/stat.h and stdbool.h.
	* io/tst-openat.c: Include stdbool.h.
	* io/tst-readlinkat.c: Include sys/stat.h.
	* io/tst-renameat.c: Include sys/stat.h.
	* io/tst-symlinkat.c: Include sys/stat.h.
	* io/tst-unlinkat.c: Include stdbool.h.
	* libio/bug-memstream1.c: Include stdlib.h.
	* libio/bug-wmemstream1.c: Include stdlib.h.
	* libio/tst-fwrite-error.c: Include stdlib.h.
	* libio/tst-memstream1.c: Include stdlib.h.
	* libio/tst-memstream2.c: Include stdlib.h.
	* libio/tst-memstream3.c: Include stdlib.h.
	* malloc/tst-interpose-aux.c: Include stdint.h.
	* misc/tst-preadvwritev-common.c: Include sys/stat.h.
	* nptl/tst-basic7.c: Include limits.h.
	* nptl/tst-cancel25.c: Include pthread.h, not pthreadP.h.
	* nptl/tst-cancel4.c: Include stddef.h, limits.h, and sys/stat.h.
	* nptl/tst-cancel4_1.c: Include stddef.h.
	* nptl/tst-cancel4_2.c: Include stddef.h.
	* nptl/tst-cond16.c: Include limits.h.
	Use sysconf(_SC_PAGESIZE) instead of __getpagesize.
	* nptl/tst-cond18.c: Include limits.h.
	Use sysconf(_SC_PAGESIZE) instead of __getpagesize.
	* nptl/tst-cond4.c: Include stdint.h.
	* nptl/tst-cond6.c: Include stdint.h.
	* nptl/tst-stack2.c: Include limits.h.
	* nptl/tst-stackguard1.c: Include stddef.h.
	* nptl/tst-tls4.c: Include stdint.h. Don't include tls.h.
	* nptl/tst-tls4moda.c: Include stddef.h.
	Don't include stdio.h, unistd.h, or tls.h.
	* nptl/tst-tls4modb.c: Include stddef.h.
	Don't include stdio.h, unistd.h, or tls.h.
	* nptl/tst-tls5.h: Include stddef.h. Don't include stdlib.h or tls.h.
	* posix/tst-getaddrinfo2.c: Include stdio.h.
	* posix/tst-getaddrinfo5.c: Include stdio.h.
	* posix/tst-pathconf.c: Include sys/stat.h.
	* posix/tst-posix_fadvise-common.c: Include stdint.h.
	* posix/tst-preadwrite-common.c: Include sys/stat.h.
	* posix/tst-regex.c: Include stdint.h.
	Don't include spawn.h or spawn_int.h.
	* posix/tst-regexloc.c: Don't include spawn.h or spawn_int.h.
	* posix/tst-vfork3.c: Include sys/stat.h.
	* resolv/tst-bug18665-tcp.c: Include stdlib.h.
	* resolv/tst-res_hconf_reorder.c: Include stdlib.h.
	* resolv/tst-resolv-search.c: Include stdlib.h.
	* stdio-common/tst-fmemopen2.c: Include stdint.h.
	* stdio-common/tst-vfprintf-width-prec.c: Include stdlib.h.
	* stdlib/test-canon.c: Include sys/stat.h.
	* stdlib/tst-tls-atexit.c: Include stdbool.h.
	* string/test-memchr.c: Include stdint.h.
	* string/tst-cmp.c: Include stdint.h.
	* sysdeps/pthread/tst-timer.c: Include stdint.h.
	* sysdeps/unix/sysv/linux/tst-sync_file_range.c: Include stdint.h.
	* sysdeps/wordsize-64/tst-writev.c: Include limits.h and stdint.h.
	* sysdeps/x86_64/fpu/math-tests-arch.h: Include cpu-features.h.
	Don't include init-arch.h.
	* sysdeps/x86_64/multiarch/test-multiarch.h: Include cpu-features.h.
	Don't include init-arch.h.
	* sysdeps/x86_64/tst-auditmod10b.c: Include link.h and stddef.h.
	* sysdeps/x86_64/tst-auditmod3b.c: Include link.h and stddef.h.
	* sysdeps/x86_64/tst-auditmod4b.c: Include link.h and stddef.h.
	* sysdeps/x86_64/tst-auditmod5b.c: Include link.h and stddef.h.
	* sysdeps/x86_64/tst-auditmod6b.c: Include link.h and stddef.h.
	* sysdeps/x86_64/tst-auditmod6c.c: Include link.h and stddef.h.
	* sysdeps/x86_64/tst-auditmod7b.c: Include link.h and stddef.h.
	* time/clocktest.c: Include stdint.h.
	* time/tst-posixtz.c: Include stdint.h.
	* timezone/tst-timezone.c: Include stdint.h.

nptl/tst-basic7.c

@@ -1,4 +1,5 @@
 #include <errno.h>
+#include <limits.h>
 #include <pthread.h>
 #include <stdio.h>
 #include <stdlib.h>

nptl/tst-cancel25.c

@@ -1,4 +1,4 @@
-#include <pthreadP.h>
+#include <pthread.h>
 #include <signal.h>
 #include <stdio.h>
 #include <stdlib.h>

nptl/tst-cancel4.c

@@ -19,6 +19,7 @@
 /* NOTE: this tests functionality beyond POSIX.  POSIX does not allow
    exit to be called more than once.  */
 
+#include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -29,12 +30,14 @@
 #include <sys/msg.h>
 #include <unistd.h>
 #include <errno.h>
+#include <limits.h>
 #include <pthread.h>
 #include <fcntl.h>
 #include <termios.h>
 #include <sys/mman.h>
 #include <sys/poll.h>
 #include <sys/wait.h>
+#include <sys/stat.h>
 
 
 /* Since STREAMS are not supported in the standard Linux kernel and

nptl/tst-cancel4_1.c

@@ -18,6 +18,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <stdio.h>
+#include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>

nptl/tst-cancel4_2.c

@@ -18,6 +18,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <stdio.h>
+#include <stddef.h>
 #include <stdlib.h>
 #include <string.h>
 #include <sys/types.h>

nptl/tst-cond16.c

@@ -17,6 +17,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <errno.h>
+#include <limits.h>
 #include <pthread.h>
 #include <stdbool.h>
 #include <stdio.h>
@@ -79,7 +80,7 @@ do_test (void)
   pthread_attr_t attr;
   int i, ret, sz;
   pthread_attr_init (&attr);
-  sz = __getpagesize ();
+  sz = sysconf (_SC_PAGESIZE);
   if (sz < PTHREAD_STACK_MIN)
 	  sz = PTHREAD_STACK_MIN;
   pthread_attr_setstacksize (&attr, sz);

nptl/tst-cond18.c

@@ -17,6 +17,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <errno.h>
+#include <limits.h>
 #include <fcntl.h>
 #include <pthread.h>
 #include <stdbool.h>
@@ -90,7 +91,7 @@ do_test (void)
   pthread_attr_t attr;
   int i, ret, sz;
   pthread_attr_init (&attr);
-  sz = __getpagesize ();
+  sz = sysconf (_SC_PAGESIZE);
   if (sz < PTHREAD_STACK_MIN)
 	  sz = PTHREAD_STACK_MIN;
   pthread_attr_setstacksize (&attr, sz);

nptl/tst-cond4.c

@@ -18,6 +18,7 @@
 
 #include <errno.h>
 #include <pthread.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

nptl/tst-cond6.c

@@ -18,6 +18,7 @@
 
 #include <errno.h>
 #include <pthread.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

nptl/tst-stack2.c

@@ -22,6 +22,7 @@
 #include <pthread.h>
 #include <stdlib.h>
 #include <stdio.h>
+#include <limits.h>
 
 static int seen;
 

nptl/tst-stackguard1.c

@@ -19,6 +19,7 @@
 #include <errno.h>
 #include <pthread.h>
 #include <stdbool.h>
+#include <stddef.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>

nptl/tst-tls4.c

@@ -19,11 +19,10 @@
 #include <dlfcn.h>
 #include <errno.h>
 #include <pthread.h>
+#include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
-#include <tls.h>
-
 
 #define N 3
 

nptl/tst-tls4moda.c

@@ -16,11 +16,8 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <stdio.h>
+#include <stddef.h>
 #include <stdlib.h>
-#include <unistd.h>
-#include <tls.h>
-
 
 static __thread unsigned char foo [32]
   __attribute__ ((tls_model ("initial-exec"), aligned (sizeof (void *))));

nptl/tst-tls4modb.c

@@ -16,11 +16,8 @@
    License along with the GNU C Library; if not, see
    <http://www.gnu.org/licenses/>.  */
 
-#include <stdio.h>
+#include <stddef.h>
 #include <stdlib.h>
-#include <unistd.h>
-#include <tls.h>
-
 
 static int i;
 int bar;

nptl/tst-tls5.h

@@ -1,7 +1,5 @@
 #include <stdint.h>
-#include <stdlib.h>
-#include <tls.h>
-
+#include <stddef.h>
 
 struct tls_obj
 {