[PATCH v3 0/2] MR5547: msvcrt: Implement _mbsncpy_s[_l]().

[Paul Gofman (＠gofman)]

ucrtbase._mbsncpy_s is used by Marvel vs Capcom when trying to create multiplayer lobby.

The functions are also present in msvcrt (unlike msvcr70, msvcr71) where I didn't add it because it behaves differently: there is at least one weirdness when it doubles the number of characters to copy ('n' parameter, not buffer size). I suppose we don't need to explore and deal with this specific until something needs those functions from msvcrt.

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  v3: msvcrt: Implement _mbsncpy_s[_l]().
      msvcr80/tests: Fix errno access in tests.

https://gitlab.winehq.org/wine/wine/-/merge_requests/5547