Remove support for EGL under X11

Now, the only supported EGL platform is Android. We might eventually add
back support for EGL/X11 or EGL/Wayland, but it will have to be
architected differently.

Source/Core/DolphinWX/GLInterface/EGL.h

@@ -10,29 +10,11 @@
 #include "Core/ConfigManager.h"
 #include "VideoBackends/OGL/GLInterfaceBase.h"
 
-
-class cPlatform
-{
-private:
-#if HAVE_X11
-	cXInterface XInterface;
-#endif
-public:
-	bool Init(EGLConfig config, void *window_handle);
-	EGLDisplay EGLGetDisplay(void);
-	EGLNativeWindowType CreateWindow(void);
-	void DestroyWindow(void);
-	void UpdateFPSDisplay(const std::string& text);
-	void SwapBuffers();
-};
-
 class cInterfaceEGL : public cInterfaceBase
 {
 private:
-	cPlatform Platform;
 	void DetectMode();
 public:
-	friend class cPlatform;
 	void SwapInterval(int Interval);
 	void Swap();
 	void SetMode(u32 mode) { s_opengl_mode = mode; }