Preprocessor: #if's out OSX-specific GL changes on other platforms

src/video_core/video_core.cpp

@@ -30,8 +30,11 @@ void Start() {
 
 /// Initialize the video core
 void Init(EmuWindow* emu_window) {
+
+#if EMU_PLATFORM == PLATFORM_MACOSX
     // Known problem with GLEW prevents contexts above 2.x on OSX unless glewExperimental is enabled.
     glewExperimental = GL_TRUE;
+#endif
 
     g_emu_window = emu_window;
     g_emu_window->MakeCurrent();