Revert "librt: avoid compilation error"

This reverts commit 08d46f1ce21e4ec51b2b1626beeaea6cbe7fdc6b.

Signed-off-by: Yann Sionneau <yann@sionneau.net>

librt/clock_nanosleep.c

@@ -36,9 +36,9 @@ clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
   if (clock_id == CLOCK_PROCESS_CPUTIME_ID)
     clock_id = MAKE_PROCESS_CPUCLOCK (0, CPUCLOCK_SCHED);
 
-#if defined(SINGLE_THREAD_P)
+  if (SINGLE_THREAD_P)
     r = INTERNAL_SYSCALL (clock_nanosleep, err, 4, clock_id, flags, req, rem);
-#else
+  else
     {
       int oldstate = LIBC_CANCEL_ASYNC ();
 
@@ -47,7 +47,6 @@ clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
 
       LIBC_CANCEL_RESET (oldstate);
     }
-#endif
 
   return (INTERNAL_SYSCALL_ERROR_P (r, err)
 	  ? INTERNAL_SYSCALL_ERRNO (r, err) : 0);