Make -Werror disabling file only

Ad fix a load of warnings

src/MobCensus.cpp

@@ -41,7 +41,8 @@ int cMobCensus::GetCapMultiplier(cMonster::eFamily a_MobFamily)
 		case cMonster::mfPassive: return 11;
 		case cMonster::mfAmbient: return 16;
 		case cMonster::mfWater:   return 5;
-		default:
+		case cMonster::mfNoSpawn:
+		case cMonster::mfUnhandled:
 		{
 			ASSERT(!"Unhandled mob family");
 			return -1;