Protect WINMM drivers list by a critical section.Take 3

[Dmitry Timoshkov]

Hello,

here is a less intrusive version of the patch, it protects the drivers
list on only adding/removing a driver.

It also restarts from the beginning of the drivers list in
DRIVER_UnloadAll after each driver unload as suggested by Alexandre.

Changelog:
    Protect WINMM drivers list by a critical section.

-- 
Dmitry.
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