[gtk+] gdkgl: Make some helper functions static

[Jasper St. Pierre <jstpierre src gnome org>]

commit 22ad7b7782a889b04f9f14b4165f0ab61fcc2fc9
Author: Jasper St. Pierre <jstpierre mecheye net>
Date:   Thu Nov 6 13:47:59 2014 -0800

    gdkgl: Make some helper functions static

 gdk/gdkgl.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)
---
diff --git a/gdk/gdkgl.c b/gdk/gdkgl.c
index 17a3a89..3b843f1 100644
--- a/gdk/gdkgl.c
+++ b/gdk/gdkgl.c
@@ -50,7 +50,7 @@ get_vertex_type_name (int type)
   return "unknown";
 }
 
-guint
+static guint
 create_shader (int type, const char const *code)
 {
   guint shader;
@@ -82,7 +82,7 @@ create_shader (int type, const char const *code)
   return shader;
 }
 
-guint
+static guint
 make_program (const char const *vertex_shader_code, const char const *fragment_shader_code)
 {
   guint program, vertex_shader, fragment_shader;