_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/mbctolowe…
More information about application crash:
https://bugs.winehq.org/show_bug.cgi?id=45273
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v7: msvcrt: Fix error handling in _mbslwr_s_l.
msvcrt: Fix error handling in _mbsupr_s_l.
msvcrt: Add support for multi-byte characters in _mbctoupper_l.
msvcrt: Add support for multi-byte characters in _mbctolower_l.
msvcrt: Fix mbcasemap initialization.
msvcrt: Add _mbsupr_s_l partial implementation.
msvcrt: Add _mbslwr_s_l partial implementation.
msvcrt: Add _mbctoupper_l partial implementation.
msvcrt: Add _mbctolower_l partial implementation.
https://gitlab.winehq.org/wine/wine/-/merge_requests/1090