winmm: do not unload drivers when the process is terminating [2/2]

[Lei Zhang]

Hi,

When winmm's DllMain gets called with fdwReason == DLL_PROCESS_DETACH,
and fImpLoad != NULL, then we should not try to unload the drivers,
because we may call the DriverProc() for a driver that has already
been unloaded earlier.
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