* Updated to ZDoom r3042:

- Added a 'restart' CCMD that allows restarting the engine with different WADs being loaded without quitting first
- Fixed handling of missing backgrounds for intermission text screens for real this time.
- Added automap patch to mark trigger lines.
- Fixed: The TouchedActors array in the Dehacked parser was not freed after parsing was done.
- Initialize the alt HUD explicitly in D_DoomMain.
- Don't let S_UnloadReverbDef leave a broken list of sound environments behind.
- Added more code to explicitly delete data before initializing it.

git-svn-id: http://mancubus.net/svn/hosted/gzdoom/trunk@1129 b0f79afe-0144-0410-b225-9a4edf0717df

src/c_cvars.cpp

@@ -600,6 +600,11 @@ void FBaseCVar::EnableCallbacks ()
 	}
 }
 
+void FBaseCVar::DisableCallbacks ()
+{
+	m_UseCallback = false;
+}
+
 //
 // Boolean cvar implementation
 //