CreateRelativePath (FileUtil and LazFileUtils): use SysUtilsExtractRelativePath inernally.
Fixes issue #0022603.


git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41036 4005530d-fff6-0310-9dd1-cebe43e6787f
Lazfileutils.pas: fix incorrect indentation from r41036

git-svn-id: http://svn.freepascal.org/svn/lazarus/trunk@41037 4005530d-fff6-0310-9dd1-cebe43e6787f