[patch, fortran] Fix PR 54033, problems with -I

[Thomas Koenig]

Hello world,

the attached, rather obvious patch emits warnings for several
cases where there is something wrong with include directories.
No test case because I couldn't figure out how to test for a
warning with no line number.

OK for trunk?

	Thomas

2012-07-26  Thomas König  <tkoenig@gcc.gnu.org>

         PR fortran/54033
         * scanner.c (add_path_to_list): Emit warning if an error occurs
         for an include path, if it is not present or if it is not a
         directory.  Do not add the path in these cases.
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