GAZA, Dec 15 (Reuters) - The ruling Hamas Islamist movement said on Friday that an Israeli soldier captured by Palestinian gunmen in June would not be freed unless the Jewish state released long-serving Palestinian prisoners. "The Israeli soldier Gilad Shalit will never be freed unless our hero prisoners, the long-serving and the faction leaders are freed in a reciprocal and simultaneous manner," senior Hamas leader Khalil Al-Hayya told a giant Hamas rally in Gaza.