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, 2 insertions, 4 deletions

diff --git a/intern/ghost/CMakeLists.txt b/intern/ghost/CMakeLists.txt
index c681dc368bb..b854908da78 100644
--- a/intern/ghost/CMakeLists.txt
+++ b/intern/ghost/CMakeLists.txt
@@ -4,13 +4,12 @@
 set(INC
   .
   ../clog
-  ../glew-mx
   ../../source/blender/imbuf
   ../../source/blender/makesdna
 )
 
 set(INC_SYS
-  ${GLEW_INCLUDE_PATH}
+  ${Epoxy_INCLUDE_DIRS}
 )
 
 set(SRC
@@ -71,8 +70,7 @@ set(SRC
 )
 
 set(LIB
-  bf_intern_glew_mx
-  ${GLEW_LIBRARY}
+  ${Epoxy_LIBRARIES}
 )
 
 if(WITH_GHOST_DEBUG)