[gegl] buffer: in gegl-tile, replace usleep() with g_thread_yield()

[Ell <ell src gnome org>]

commit 87c089d5435ff6a0878dc0c3eff6b0ff905b6483
Author: Ell <ell_se yahoo com>
Date:   Fri May 1 22:46:30 2020 +0300

    buffer: in gegl-tile, replace usleep() with g_thread_yield()
    
    usleep() is POSIX-specific.

 gegl/buffer/gegl-tile.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/gegl/buffer/gegl-tile.c b/gegl/buffer/gegl-tile.c
index 68f239eed..cdc6e4134 100644
--- a/gegl/buffer/gegl-tile.c
+++ b/gegl/buffer/gegl-tile.c
@@ -325,7 +325,7 @@ gegl_tile_lock (GeglTile *tile)
 
       ++count;
       if (count > 32)
-        usleep (1);
+        g_thread_yield ();
     }
 }