_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
-- 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.