Some emplace_back replacements (#5149)

* replace push_back with emplace_back when a new object was created in the function call

src/Mobs/Pig.cpp

@@ -34,7 +34,7 @@ void cPig::GetDrops(cItems & a_Drops, cEntity * a_Killer)
 	AddRandomDropItem(a_Drops, 1, 3 + LootingLevel, IsOnFire() ? E_ITEM_COOKED_PORKCHOP : E_ITEM_RAW_PORKCHOP);
 	if (m_bIsSaddled)
 	{
-		a_Drops.push_back(cItem(E_ITEM_SADDLE, 1));
+		a_Drops.emplace_back(E_ITEM_SADDLE, 1);
 	}
 }