CMake: Don't search for the OpenGL library on Mac OS X. It's always there.
diff --git a/CMakeLists.txt b/CMakeLists.txt
index bb69a84..43d1609 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -1151,10 +1151,6 @@ elseif(APPLE)
set(SDL_VIDEO_OPENGL 1)
set(SDL_VIDEO_OPENGL_CGL 1)
set(SDL_VIDEO_RENDER_OGL 1)
- if(DARWIN)
- find_library(OpenGL_LIBRARY OpenGL)
- list(APPEND EXTRA_LIBRARIES ${OpenGL_LIBRARY})
- endif()
set(HAVE_VIDEO_OPENGL TRUE)
endif()
endif()