[PATCH v2 0/1] MR10805: Draft: msvcrt: only convert _tolower_l if not exact match already

[Stephan Seitz (＠theHamsta)]

This optimizations brought some speed-ups in
https://gitlab.winehq.org/wine/wine/-/merge_requests/10804 for the
equivalent `memicmp_strW` function as it avoids converting and locale
lookup for exact matches.

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  v2: msvcrt: only convert _tolower_l if not exact match already
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/10805