replace GLEW with libepoxytemp-libepoxy

As discussed in https://developer.blender.org/D12034#412258, GLEW should be replaced by libepoxy to enable dynamic loading of OpenGL.

Build:
```sh
make lite debug ninja BUILD_CMAKE_ARGS="-DWITH_GHOST_X11=OFF -DWITH_GHOST_WAYLAND=ON -DWITH_GHOST_WAYLAND_LIBDECOR=ON -DPYTHON_VERSION=3.10" BUILD_DIR="../blender_build"
```

Verify that there are no X11 dependencies any more:
```sh
lddtree ./blender_build/bin/blender
```
and:
```sh
./blender_build/bin/blender
```

should then start a pure Wayland client.

This also works with GLX (`-DWITH_GHOST_X11=ON -DWITH_GHOST_WAYLAND=OFF`).

This has not been tested on other systems (Windows, macOS) as I do not have access to those systems and the build bot does not allow me to trigger experimental builds any more (I get "you need to have role 'any-control'").

Reviewed By: campbellbarton, brecht, jbakker

Differential Revision: https://developer.blender.org/D15291

1 files changed, 0 insertions, 57 deletions

diff --git a/intern/glew-mx/glew-mx.h b/intern/glew-mx/glew-mx.h
deleted file mode 100644
index e7972697010..00000000000
--- a/intern/glew-mx/glew-mx.h
+++ /dev/null
@@ -1,57 +0,0 @@
-/* SPDX-License-Identifier: GPL-2.0-or-later
- * Copyright 2014 Blender Foundation. All rights reserved. */
-
-/** \file
- * \ingroup intern_glew-mx
- *
- * Support for GLEW Multiple rendering conteXts (MX)
- * Maintained as a Blender Library.
- *
- * Different rendering contexts may have different entry points
- * to extension functions of the same name.  So it can cause
- * problems if, for example, a second context uses a pointer to
- * say, glActiveTextureARB, that was queried from the first context.
- *
- * GLEW has basic support for multiple contexts by enabling WITH_GLEW_MX,
- * but it does not provide a full implementation.  This is because
- * there are too many questions about thread safety and memory
- * allocation that are up to the user of GLEW.
- *
- * This implementation is very basic and isn't thread safe.
- * For a single context the overhead should be
- * no more than using GLEW without WITH_GLEW_MX enabled.
- */
-
-#ifndef __GLEW_MX_H__
-#define __GLEW_MX_H__
-
-#include <GL/glew.h>
-
-#ifdef __cplusplus
-extern "C" {
-#endif
-
-#include "intern/symbol-binding.h"
-
-/* If compiling only for OpenGL 3.2 Core Profile then we should make sure
- * no legacy API entries or symbolic constants are used.
- */
-#if (!defined(WITH_LEGACY_OPENGL)) || defined(WITH_GL_PROFILE_CORE) && \
-                                          !defined(WITH_GL_PROFILE_COMPAT) && \
-                                          !defined(WITH_GL_PROFILE_ES20)
-#  include "intern/gl-deprecated.h"
-#endif
-
-GLenum glew_chk(GLenum error, const char *file, int line, const char *text);
-
-#ifndef NDEBUG
-#  define GLEW_CHK(x) glew_chk((x), __FILE__, __LINE__, #  x)
-#else
-#  define GLEW_CHK(x) glew_chk((x), NULL, 0, NULL)
-#endif
-
-#ifdef __cplusplus
-}
-#endif
-
-#endif /* __GLEW_MX_H__ */