[gthumb] removed unused include

[Paolo Bacchilega <paobac src gnome org>]

commit 4f654fae50ec3782efeffce2a37f70d4afac0d7c
Author: Paolo Bacchilega <paobac src gnome org>
Date:   Fri May 21 09:16:46 2021 +0200

    removed unused include

 gthumb/gth-main.c | 4 ----
 1 file changed, 4 deletions(-)
---
diff --git a/gthumb/gth-main.c b/gthumb/gth-main.c
index 3e9e94a6..6b881294 100644
--- a/gthumb/gth-main.c
+++ b/gthumb/gth-main.c
@@ -38,10 +38,6 @@
 #include "pixbuf-io.h"
 #include "typedefs.h"
 
-#ifdef GDK_WINDOWING_X11
-#include <gdk/gdkx.h>
-#endif
-
 
 static GMutex register_mutex;