LFN updates: ported FreeDOS' truename function to be able to handle
int21/ax=7160 better, and to avoid escaping the drive letter "sandbox".
"...." = "..\..\.." etc work too.
Just like dir c:\foo\.. when foo does not exist (another DOS oddity).


git-svn-id: https://dosemu.svn.sourceforge.net/svnroot/dosemu/trunk@412 7758b857-130e-0410-ab9c-d8735a528d18