1. This should fix Issue 1625 (Bizarre Auto Frame Limit)

Now the frame limiter yields on CPU thread, not as before on GPU thread mistakenly

2. Fixed clear of VI interrupts
   I guess VI interrupts are not used at all, because they were never cleared before

3. Made GPU thread 0% processor usage when paused whatever your active config is.
   I tried the event approach but somehow the thread resume latency is excessively long (Who can tell me why?)

git-svn-id: https://dolphin-emu.googlecode.com/svn/trunk@4790 8ced0084-cf51-0410-be5f-012b33b47a6e

Source/Plugins/Plugin_VideoOGL/Src/Render.cpp

@@ -597,6 +597,9 @@ void Renderer::SetBlendMode(bool forceUpdate)
 
 u32 Renderer::AccessEFB(EFBAccessType type, int x, int y)
 {
+	if(!g_ActiveConfig.bEFBAccessEnable)
+		return 0;
+
 	// Get the rectangular target region covered by the EFB pixel.
 	EFBRectangle efbPixelRc;
 	efbPixelRc.left = x;