FileUtil: inline ExpandFileNameUTF8 as LazFileUtils.ExpandFileNameUTF8,
which has better handling of unicode characters on Windows.
(One step in the moving of UTF8 related filefunctions to LazFileUtils)


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41038 4005530d-fff6-0310-9dd1-cebe43e6787f