LazFileUtils: Fix FileExistsUTF8 on Windows when FileName contains uncode
characters outside current codepage.


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41283 4005530d-fff6-0310-9dd1-cebe43e6787f
FileUtil: inline FileExistsUTF8 to use LazFileUtils.FileExistsUTF8.


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41284 4005530d-fff6-0310-9dd1-cebe43e6787f
LazFileUtils: Fix DirectoryExistsUTF8 on Windows when Directory contains
unicode characters outside current codepage.


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41285 4005530d-fff6-0310-9dd1-cebe43e6787f