support: Make support_process_state_wait wait less

Tests such as posix/tst-waitid.c make heavy use of
support_process_state_wait, and thus on non-Linux where it falls back
to sleeping, a 2s sleep makes such test time out, while 1s remains
fine enough.

support/support_process_state.c

@@ -88,5 +88,5 @@ support_process_state_wait (pid_t pid, enum support_process_state state)
   xfclose (fstatus);
   /* Fallback to nanosleep if an invalid state is found.  */
 #endif
-  nanosleep (&(struct timespec) { 2, 0 }, NULL);
+  nanosleep (&(struct timespec) { 1, 0 }, NULL);
 }