By Ahmed Rasheed and Moayed Kenany BAGHDAD (Reuters) -Arab leaders at a summit in Baghdad called on Saturday for an immediate end to the war in Gaza, accusing Israel in starker language of trying to drive the Palestinians out of the enclave altogether after it ramped up its bombing campaign. Israel has killed hundreds of Palestinians since Thursday in one of the deadliest waves of bombardment since a truce collapsed in March, even as U.S. Presid…