Add back X11 support to EGL

Refactor the EGL backend to provide a platform separation here, which is
better abstracted away than the old EGL/X11 implementation.

Source/Core/DolphinWX/GLInterface/EGLAndroid.h

@@ -0,0 +1,15 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include "DolphinWX/GLInterface/EGL.h"
+
+class cInterfaceEGLAndroid : public cInterfaceEGL
+{
+protected:
+	EGLDisplay OpenDisplay() override;
+	EGLNativeWindowType InitializePlatform(EGLNativeWindowType host_window, EGLConfig config) override;
+	void ShutdownPlatform() override;
+};