y2038: fix: Add missing libc_hidden_def attribute for some syscall wrappers

During the conversion to support 64 bit time on some architectures with
__WORDSIZE == 32 && __TIMESIZE != 64 the libc_hidden_def attribute for
eligible functions was by mistake omitted.

This patch fixes this issue and exports (and allows using) those
functions when Y2038 support is enabled in glibc.

sysdeps/unix/sysv/linux/clock_getres.c

@@ -72,6 +72,8 @@ __clock_getres64 (clockid_t clock_id, struct __timespec64 *res)
 }
 
 #if __TIMESIZE != 64
+libc_hidden_def (__clock_getres64)
+
 int
 __clock_getres (clockid_t clock_id, struct timespec *res)
 {

sysdeps/unix/sysv/linux/clock_gettime.c

@@ -73,6 +73,8 @@ __clock_gettime64 (clockid_t clock_id, struct __timespec64 *tp)
 }
 
 #if __TIMESIZE != 64
+libc_hidden_def (__clock_gettime64)
+
 int
 __clock_gettime (clockid_t clock_id, struct timespec *tp)
 {

sysdeps/unix/sysv/linux/clock_nanosleep.c

@@ -79,6 +79,8 @@ __clock_nanosleep_time64 (clockid_t clock_id, int flags, const struct __timespec
 }
 
 #if __TIMESIZE != 64
+libc_hidden_def (__clock_nanosleep_time64)
+
 int
 __clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
                    struct timespec *rem)

sysdeps/unix/sysv/linux/clock_settime.c

@@ -55,6 +55,8 @@ __clock_settime64 (clockid_t clock_id, const struct __timespec64 *tp)
 }
 
 #if __TIMESIZE != 64
+libc_hidden_def (__clock_settime64)
+
 int
 __clock_settime (clockid_t clock_id, const struct timespec *tp)
 {

sysdeps/unix/sysv/linux/ppoll.c

@@ -67,6 +67,8 @@ __ppoll64 (struct pollfd *fds, nfds_t nfds, const struct __timespec64 *timeout,
 }
 
 #if __TIMESIZE != 64
+libc_hidden_def (__ppoll64)
+
 int
 __ppoll (struct pollfd *fds, nfds_t nfds, const struct timespec *timeout,
          const sigset_t *sigmask)