[PATCH v6 0/4] MR1090: msvcrt: implement missing CRT functions to fix ChessBase 14 crash

[Bartosz Kosiorek (＠gang65)]

_mbctolower_l - converts multibyte uppercase character to lowercase character, by using specified locale that's passed in.

More information about these methods are available at:
https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/mbctolower...

More information about application crash:
https://bugs.winehq.org/show_bug.cgi?id=45273

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  v6: msvcrt: Add _mbsupr_s_l partial implementation.
      msvcrt: Add _mbslwr_s_l partial implementation.

https://gitlab.winehq.org/wine/wine/-/merge_requests/1090