libstdc++ testsuite fixes, 1

[Mark Mitchell]

>>>>> "Gabriel" == Gabriel Dos Reis <Gabriel.Dos-Reis@cmla.ens-cachan.fr> writes:

    Gabriel> Did this really break before this week-end?  I doubt
    Gabriel> it...

It probably worked for me because I was on the branch and the
testsuite wasn't. :-)

    Gabriel> lookfor_file returns a relative path of libstdc++-v3.

    Gabriel> Anyway, I'm for canonilizing the pathname.

Great.  Would you mind providing a patch?

Thank you,

--
Mark Mitchell                   mark@codesourcery.com
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