[gtk/wip/nirbheek/gtk-3-24-meson: 409/420] meson: Disable X11 support on Darwin

[Chun-wei Fan <fanchunwei src gnome org>]

commit 500a7033db9a66c1dbf596d27d759e489f130edb
Author: Philippe Normand <phil base-art net>
Date:   Sun Nov 25 17:20:54 2018 +0000

    meson: Disable X11 support on Darwin
    
    The Quartz backend should fulfill most requirements anyway.

 meson.build | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/meson.build b/meson.build
index a78876f884..94ed7e155a 100644
--- a/meson.build
+++ b/meson.build
@@ -108,6 +108,7 @@ os_unix = not os_win32
 
 if os_darwin
   wayland_enabled = false
+  x11_enabled = false
 else
   quartz_enabled = false
 endif