[PATCH v2 0/2] MR6719: msvcrt: Improve DBCS support for _toupper_l().

[Jactry Zeng (＠jactry)]

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  v2: msvcrt: Improve DBCS support for _toupper_l().
      msvcrt/tests: Test toupper() with DBCS.
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/6719