[Openal-devel] Fix mixer sleeping for Windows

[Chris Robinson]

Under Windows sleeping is done with Sleep, which takes millisecond values, 
while the wrapper _alMicroSleep takes microseconds. The wrapper simply 
divides the value to get milliseconds, however when given a value of 1 the 
call becomes Sleep(0), which only yields the CPU but returns immediately if 
nothing else is waiting.. which leads to unrelenting CPU usage and the 
inability for other threads to acquire certain locks.

This patch makes sure the CPU is given up between loop iterations.
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