Make -Werror disabling file only

Ad fix a load of warnings

src/Mobs/Creeper.cpp

@@ -60,7 +60,7 @@ void cCreeper::GetDrops(cItems & a_Drops, cEntity * a_Killer)
 		return;
 	}
 
-	int LootingLevel = 0;
+	unsigned int LootingLevel = 0;
 	if (a_Killer != nullptr)
 	{
 		LootingLevel = a_Killer->GetEquippedWeapon().m_Enchantments.GetLevel(cEnchantments::enchLooting);