[mutter] cogl: Remove some unused #define GL_BLAH safeties

[Georges Basile Stavracas Neto <gbsneto src gnome org>]

commit 1398c6dfa4aae6b2b91eb05370e7c4c5bdfb693f
Author: Adam Jackson <ajax redhat com>
Date:   Thu Apr 9 15:13:25 2020 -0400

    cogl: Remove some unused #define GL_BLAH safeties
    
    None of these constants are referenced in the files defining them.
    
    https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1194

 cogl/cogl/cogl-attribute.c    |  5 -----
 cogl/cogl/cogl-context.c      |  5 -----
 cogl/cogl/cogl-pixel-buffer.c | 16 ----------------
 3 files changed, 26 deletions(-)
---
diff --git a/cogl/cogl/cogl-attribute.c b/cogl/cogl/cogl-attribute.c
index 6c1842e172..1c0c88d0b9 100644
--- a/cogl/cogl/cogl-attribute.c
+++ b/cogl/cogl/cogl-attribute.c
@@ -51,11 +51,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 
-/* This isn't defined in the GLES headers */
-#ifndef GL_UNSIGNED_INT
-#define GL_UNSIGNED_INT 0x1405
-#endif
-
 static void _cogl_attribute_free (CoglAttribute *attribute);
 
 COGL_OBJECT_DEFINE (Attribute, attribute);
diff --git a/cogl/cogl/cogl-context.c b/cogl/cogl/cogl-context.c
index e6effb0080..dc99f35086 100644
--- a/cogl/cogl/cogl-context.c
+++ b/cogl/cogl/cogl-context.c
@@ -51,11 +51,6 @@
 #include <string.h>
 #include <stdlib.h>
 
-/* These aren't defined in the GLES headers */
-#ifndef GL_POINT_SPRITE
-#define GL_POINT_SPRITE 0x8861
-#endif
-
 static void _cogl_context_free (CoglContext *context);
 
 COGL_OBJECT_DEFINE (Context, context);
diff --git a/cogl/cogl/cogl-pixel-buffer.c b/cogl/cogl/cogl-pixel-buffer.c
index 7abebaccce..d7d3839715 100644
--- a/cogl/cogl/cogl-pixel-buffer.c
+++ b/cogl/cogl/cogl-pixel-buffer.c
@@ -51,22 +51,6 @@
 #include "cogl-pixel-buffer.h"
 #include "cogl-gtype-private.h"
 
-/*
- * GL/GLES compatibility defines for the buffer API:
- */
-
-#if defined (HAVE_COGL_GL)
-
-#ifndef GL_PIXEL_UNPACK_BUFFER
-#define GL_PIXEL_UNPACK_BUFFER GL_PIXEL_UNPACK_BUFFER_ARB
-#endif
-
-#ifndef GL_PIXEL_PACK_BUFFER
-#define GL_PIXEL_PACK_BUFFER GL_PIXEL_PACK_BUFFER_ARB
-#endif
-
-#endif
-
 static void
 _cogl_pixel_buffer_free (CoglPixelBuffer *buffer);