Make LevelLocals::ExecuteSpecial return int

# Conflicts:
#	wadsrc/static/zscript/base.txt

wadsrc/static/zscript/base.txt

@@ -675,7 +675,7 @@ struct LevelLocals native
 	native String GetUDMFString(int type, int index, Name key);
 	native int GetUDMFInt(int type, int index, Name key);
 	native double GetUDMFFloat(int type, int index, Name key);
-	native bool ExecuteSpecial(int special, Actor activator, line linedef, bool lineside, int arg1 = 0, int arg2 = 0, int arg3 = 0, int arg4 = 0, int arg5 = 0);
+	native int ExecuteSpecial(int special, Actor activator, line linedef, bool lineside, int arg1 = 0, int arg2 = 0, int arg3 = 0, int arg4 = 0, int arg5 = 0);
 	native static void GiveSecret(Actor activator, bool printmsg = true, bool playsound = true);
 	native static void StartSlideshow(Name whichone = 'none');
 	native static void WorldDone();