[PATCH v6 0/3] MR600: wine{alsa,pulse}: Merge unixlib.h, move it into mmdevapi

[Davide Beatrici (＠davidebeatrici)]

This is the very first step for merging the `mmdevdrv.c` files into a single one.

The commit strictly focuses on Linux drivers, `wine{oss,coreaudio}` will follow.

Huge thanks to @jacek and @huw for making this simple, as they took care of ELF/PE separation.

--
  v6: mmdevapi: Integrate winepulse's additions in unixlib.h
      winealsa: Move common unixlib.h content into mmdevapi
      winealsa: Drop "alsa_" prefix in unixlib enum, apply it to the functions instead
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/600