DejaGnu PATCH to lib/dg.exp: enhance support for "exotic" dir-names

[Benjamin Kosnik]

> We only maintain a local copy of dejagnu, which is used by GDB and SID,
> two Open Source projects that use it for testing.

...and is the only actively-maintained repository, unfortunately. Thus 
you are the defacto maintainers, IMHO.

> I added your patch to my TODO list (a long one).
> We don't currently seem to need it as we don't use funny directory names
> though.
> So, I can't promise you a high priority -- sorry!

In order to do 'make check-g++' and have the results test libstdc++ this is 
necessary. This functionality is requested as part of the impending 
gcc-3 branch. It's been approved by jim wilson, sanity checked by me, etc. 

Your cooperation is appreciated.

truly ++__--exotic--__++,
benjamin