ISLAMABAD/DUBAI—Pakistan’s former president, Pervez Musharraf, a key U.S. ally in the campaign against al-Qaeda following the terrorist group’s Sept. 11, 2001, attacks, died in Dubai on Feb. 5 after a prolonged illness. He was 79. Musharraf, a former four-star general who seized power after a 1999 military coup, died at a hospital in Dubai, where…