Move GLInterface around to remove VideoBackends dependency on DolphinWX

Source/Core/DolphinWX/GLInterface/GLInterface.cpp

@@ -0,0 +1,23 @@
+// Copyright 2014 Dolphin Emulator Project
+// Licensed under GPLv2
+// Refer to the license.txt file included.
+
+#include "DolphinWX/GLInterface/GLInterface.h"
+#include "VideoBackends/OGL/GLInterfaceBase.h"
+
+GLWindow GLWin;
+
+cInterfaceBase* HostGL_CreateGLInterface()
+{
+	#if defined(USE_EGL) && USE_EGL
+		return new cInterfaceEGL;
+	#elif defined(__APPLE__)
+		return new cInterfaceAGL;
+	#elif defined(_WIN32)
+		return new cInterfaceWGL;
+	#elif defined(HAVE_X11) && HAVE_X11
+		return new cInterfaceGLX;
+	#else
+		return nullptr;
+	#endif
+}