[gtk] gl renderer: Remove unused field

[Timm Bäder <baedert src gnome org>]

commit cc66b50dcd2c9a0996d59e4c5b9d125dfd8d30f8
Author: Timm Bäder <mail baedert org>
Date:   Wed Apr 11 10:10:38 2018 +0200

    gl renderer: Remove unused field

 gsk/gl/gskglrenderer.c | 2 --
 1 file changed, 2 deletions(-)
---
diff --git a/gsk/gl/gskglrenderer.c b/gsk/gl/gskglrenderer.c
index 2561335bca..5fdc73dd38 100644
--- a/gsk/gl/gskglrenderer.c
+++ b/gsk/gl/gskglrenderer.c
@@ -224,8 +224,6 @@ struct _GskGLRenderer
 #endif
 
   cairo_region_t *render_region;
-
-  gboolean has_buffers : 1;
 };
 
 struct _GskGLRendererClass