Rename module sys_wait to sys_wait-h.

* modules/sys_wait-h: Renamed from modules/sys_wait.
* modules/sys_wait-h-tests: Renamed from modules/sys_wait-tests.
* modules/sys_wait-h-c++-tests: Renamed from modules/sys_wait-c++-tests.
* tests/test-sys_wait-h.h: Renamed from tests/test-sys_wait.h.
* tests/test-sys_wait-h.c: Renamed from tests/test-sys_wait.c.
* tests/test-stdlib-h.c: Update.
* tests/test-sys_wait-h-c++.cc: Renamed from tests/test-sys_wait-c++.cc.
* doc/posix-headers/sys_wait.texi: Update.
* modules/* (Depends-on): Update.
* modules/sys_wait: New file.

modules/sys_wait-h

@@ -0,0 +1,48 @@
+Description:
+A <sys/wait.h> for systems with missing declarations.
+
+Files:
+lib/sys_wait.in.h
+m4/sys_wait_h.m4
+m4/pid_t.m4
+
+Depends-on:
+gen-header
+include_next
+snippet/c++defs
+snippet/warn-on-use
+
+configure.ac:
+gl_SYS_WAIT_H
+gl_SYS_WAIT_H_REQUIRE_DEFAULTS
+AC_PROG_MKDIR_P
+
+Makefile.am:
+BUILT_SOURCES += sys/wait.h
+
+# We need the following in order to create <sys/wait.h> when the system
+# has one that is incomplete.
+sys/wait.h: sys_wait.in.h $(top_builddir)/config.status $(CXXDEFS_H) $(WARN_ON_USE_H)
+	$(AM_V_GEN)$(MKDIR_P) '%reldir%/sys'
+	$(AM_V_at)$(SED_HEADER_STDOUT) \
+	      -e 's|@''GUARD_PREFIX''@|${gl_include_guard_prefix}|g' \
+	      -e 's|@''INCLUDE_NEXT''@|$(INCLUDE_NEXT)|g' \
+	      -e 's|@''PRAGMA_SYSTEM_HEADER''@|@PRAGMA_SYSTEM_HEADER@|g' \
+	      -e 's|@''PRAGMA_COLUMNS''@|@PRAGMA_COLUMNS@|g' \
+	      -e 's|@''NEXT_SYS_WAIT_H''@|$(NEXT_SYS_WAIT_H)|g' \
+	      -e 's/@''GNULIB_WAITPID''@/$(GNULIB_WAITPID)/g' \
+	      -e '/definitions of _GL_FUNCDECL_RPL/r $(CXXDEFS_H)' \
+	      -e '/definition of _GL_WARN_ON_USE/r $(WARN_ON_USE_H)' \
+	      $(srcdir)/sys_wait.in.h > $@-t
+	$(AM_V_at)mv $@-t $@
+MOSTLYCLEANFILES += sys/wait.h sys/wait.h-t
+MOSTLYCLEANDIRS += sys
+
+Include:
+<sys/wait.h>
+
+License:
+LGPLv2+
+
+Maintainer:
+all