Fix thread starvation for xine_get_param() on multi-core systems.

ao_loop() called sched_yield() to give other threads a chance to acquire
driver->lock. But on multi-core systems, it takes too long to wake up the
acquiring thread so that ao_loop() takes driver->lock again before the
other threads had a chance to acquire it.
Therefore a cond var is introduced which ao_loop() can wait for. The
cond var will be signalled when one of the other threads has acquired
driver->lock. This prevents starvation.

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