[patch, fortran] Fix PR 55919

[Thomas Koenig]

Hello world,

the attached patch fixes a regression where -J dirpath/ would
issue a warning on Windows because of the trailing dir separator.

Regression-tested, but only on Linux.  I would appreciate if
somebody could also test it on Windows (and run the test case,
of course).

OK for trunk?

	Thomas

2013-01-20  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/55919
         * add_path_to_list:  Copy path to temporary and strip
         trailing directory separators before calling stat().

2013-01-20  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/55919
         * gfortran.dg/include_8.f90:  New test.
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