emacs-27 1482a75: Fix build failure with Fx_gtk_debug

[Martin Rudalics]

branch: emacs-27
commit 1482a75efa7e198b38bd6871c1b35eedc2c94fca
Author: Martin Rudalics <address@hidden>
Commit: Martin Rudalics <address@hidden>

    Fix build failure with Fx_gtk_debug
    
    * src/xfns.c (Fx_gtk_debug, Sx_gtk_debug): Define only for GTK
    versions >= 3.14.0 so gtk_window_set_interactive_debugging is
    defined.  Reported by Andreas Schwab  <address@hidden>.
---
 src/xfns.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/xfns.c b/src/xfns.c
index 0fc5530..a5431aa 100644
--- a/src/xfns.c
+++ b/src/xfns.c
@@ -7755,6 +7755,7 @@ Note: Text drawn with the `x' font backend is shown with 
hollow boxes.  */)
 
 #ifdef USE_GTK
 #ifdef HAVE_GTK3
+#if GTK_CHECK_VERSION (3, 14, 0)
 DEFUN ("x-gtk-debug", Fx_gtk_debug, Sx_gtk_debug, 1, 1, 0,
        doc: /* Toggle interactive GTK debugging.   */)
   (Lisp_Object enable)
@@ -7767,6 +7768,7 @@ DEFUN ("x-gtk-debug", Fx_gtk_debug, Sx_gtk_debug, 1, 1, 0,
 
   return NILP (enable) ? Qnil : Qt;
 }
+#endif /* GTK_CHECK_VERSION (3, 14, 0) */
 #endif /* HAVE_GTK3 */
 #endif /* USE_GTK */
 
@@ -8154,7 +8156,9 @@ eliminated in future versions of Emacs.  */);
 #endif
 #ifdef USE_GTK
 #ifdef HAVE_GTK3
+#if GTK_CHECK_VERSION (3, 14, 0)
   defsubr (&Sx_gtk_debug);
 #endif
 #endif
+#endif
 }