FileUtil: inline DirectoryExistsUTF8 to LazFileutils.DirectoryExistsUTF8.


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41286 4005530d-fff6-0310-9dd1-cebe43e6787f
LazFileUtils: fix FileAgeUTF8 on Windows when FileName contains unicode
characters outside current codepage.


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41287 4005530d-fff6-0310-9dd1-cebe43e6787f