Add VSync option in Windows. Turns itself off when unthrottled.

Windows/WndMainWindow.cpp

@@ -586,6 +586,10 @@ namespace MainWindow
 				g_Config.bMipMap = !g_Config.bMipMap;
 				break;
 
+			case ID_OPTIONS_VSYNC:
+				g_Config.iVSyncInterval = !g_Config.iVSyncInterval;
+				break;
+
 			case ID_TEXTURESCALING_OFF:
 				setTexScalingLevel(1);
 				break;
@@ -897,6 +901,7 @@ namespace MainWindow
 		CHECKITEM(ID_OPTIONS_SHOWFPS, g_Config.bShowFPSCounter);
 		CHECKITEM(ID_OPTIONS_FRAMESKIP, g_Config.iFrameSkip != 0);
 		CHECKITEM(ID_OPTIONS_MIPMAP, g_Config.bMipMap);
+		CHECKITEM(ID_OPTIONS_VSYNC, g_Config.iVSyncInterval != 0);
 		CHECKITEM(ID_OPTIONS_TOPMOST, g_Config.bTopMost);
 		CHECKITEM(ID_EMULATION_SOUND, g_Config.bEnableSound);
 		CHECKITEM(ID_TEXTURESCALING_DEPOSTERIZE, g_Config.bTexDeposterize);