[PATCH v3 0/4] 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.

--
  v3: winepulse: Switch to mmdevapi's unixlib.h
      mmdevapi: Integrate winepulse's additions in unixlib.h
      mmdevapi: Drop "alsa_" prefix in unixlib.h
      winealsa: Move common unixlib.h content into mmdevapi

https://gitlab.winehq.org/wine/wine/-/merge_requests/600