[Lazarus] FileUtil.FindAllFiles - case-sensitive on Unix

[AlexeyT]

procedure FindAllFiles(AList: TStrings; const SearchPath: String;

    Searcher.Search(SearchPath, SearchMask, SearchSubDirs);

Here we miss parameter "CaseSensitive=False". So on Linux it is False 
and function does case-insens search. It is slower! Why not to add param 
True for Unix. Not sure about macOS.

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Regards,
Alexey