Switch from USING_GLES2 to MOBILE_DEVICE.

Still using USING_GLES2 for, well, GLES2.  But for things that are really
about mobile, we need a new define.  Devices are coming that don't use
GLES2.

GPU/GLES/Framebuffer.cpp

@@ -1677,7 +1677,7 @@ void FramebufferManager::UpdateFromMemory(u32 addr, int size, bool safe) {
 }
 
 void FramebufferManager::NotifyBlockTransfer(u32 dst, u32 src) {
-#ifndef USING_GLES2
+#ifndef MOBILE_DEVICE
 	if (!reportedBlits_.insert(std::make_pair(dst, src)).second) {
 		// Already reported/checked.
 		return;