Saudi Arabia Bans Mobile Phone Cameras By ABDULLAH SHIHRI    RIYADH, Saudi Arabia (AP) -- Saudi Arabia's highest religious authority has barred the use of mobile phones with built-in cameras, blaming them for "spreading obscenity."    The edict, which follows a failed ban on the sale and import of the wildly popular devices, is the most sweeping attempt by any nation to prevent the voyeurism invited by the new technology.    Camera-equipped phones have caught on fast in parts of Asia, Europe and the Middle East - particularly in oil-rich Gulf countries - prompting complaints about privacy in places where people undress, "theft" of reading materials at book stores and newsstands, and corporate espionage by employees...