[cogl] Fix including a non-existent header

[Neil Roberts <nroberts src gnome org>]

commit f6767859061cf49630403326a6ca69659de60840
Author: Neil Roberts <neil linux intel com>
Date:   Thu Apr 5 15:29:03 2012 +0100

    Fix including a non-existent header
    
    cogl-sampler-cache-private.h was including a header which doesn't
    exist so the build was broken. The header comes from a patch which
    hasn't been pushed to master yet which splits including GL/gl.h out of
    cogl-defines.h into a separate header. I added the inclusion to make
    it pick up the GL defines but it doesn't need to do this yet because
    cogl-context.h is still including the GL header. I didn't notice the
    failure because I still had a cogl-gl-header.h lying around from a
    previous build with the patch.
    
    Reviewed-by: Robert Bragg <robert linux intel com>

 cogl/cogl-sampler-cache-private.h |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)
---
diff --git a/cogl/cogl-sampler-cache-private.h b/cogl/cogl-sampler-cache-private.h
index 4eb7503..7e1d17c 100644
--- a/cogl/cogl-sampler-cache-private.h
+++ b/cogl/cogl-sampler-cache-private.h
@@ -26,7 +26,6 @@
 #define __COGL_SAMPLER_CACHE_PRIVATE_H
 
 #include "cogl-context.h"
-#include "cogl-gl-header.h"
 
 /* GL_ALWAYS is just used here as a value that is known not to clash
  * with any valid GL wrap modes.