[cogl] Fix a warning when building without GLES2 support

[Neil Roberts <nroberts src gnome org>]

commit 34143bc6f1239c9cb22ba613521ba9ee7ec7059a
Author: Neil Roberts <neil linux intel com>
Date:   Mon Oct 1 15:30:20 2012 +0100

    Fix a warning when building without GLES2 support
    
    Since commit 2701b93f cogl-pipeline-opengl.c always has code which
    calls _cogl_pipeline_progend_glsl_get_attrib_location but the header
    declaring this function was only included if GLES2 support was
    enabled. This was making it give an annoying warning so let's just
    unconditionally include it.
    
    Reviewed-by: Robert Bragg <robert linux intel com>

 cogl/driver/gl/cogl-pipeline-opengl.c |    3 ---
 1 files changed, 0 insertions(+), 3 deletions(-)
---
diff --git a/cogl/driver/gl/cogl-pipeline-opengl.c b/cogl/driver/gl/cogl-pipeline-opengl.c
index fe4558b..a65caf9 100644
--- a/cogl/driver/gl/cogl-pipeline-opengl.c
+++ b/cogl/driver/gl/cogl-pipeline-opengl.c
@@ -37,10 +37,7 @@
 #include "cogl-framebuffer-private.h"
 #include "cogl-offscreen.h"
 
-/* This is needed to set the color attribute on GLES2 */
-#ifdef HAVE_COGL_GLES2
 #include "cogl-pipeline-progend-glsl-private.h"
-#endif
 
 #include <glib.h>
 #include <string.h>