FileUtil: inline FileOpenUTF8, FileCreateUTF8 and FileCreateUTF8 to their LazFileUtils counterparts.
Next step in moving UTF8 file routines to LazFileUtils.


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41211 4005530d-fff6-0310-9dd1-cebe43e6787f