Do not populate pure Xism x_sync to other ports.

* frame.h (x_sync): Move under HAVE_X_WINDOWS.
* frame.c (other_visible_frames) [HAVE_X_WINDOWS]: Use as such.
* nsfns.m, w32xfns.c (x_sync): Remove no-op.
* w32term.h (x_sync): Remove prototype.

1 files changed, 0 insertions, 6 deletions

diff --git a/src/w32xfns.c b/src/w32xfns.c
index 19c6b72bf89..7629e49caf8 100644
--- a/src/w32xfns.c
+++ b/src/w32xfns.c
@@ -333,9 +333,3 @@ drain_message_queue (void)
     }
   return retval;
 }
-
-/* x_sync is a no-op on W32.  */
-void
-x_sync (struct frame *f)
-{
-}