cmFortranParser: Skip #line directives that do not name files
Since commit v3.5.0-rc1~241^2~1 (cmFortranParser: Parse #line directives, 2015-11-02) our Fortran dependency scanner parses `#line` directives to extract the named files. However, some compilers produce `#line` directives that name directories instead of files. Work around such cases by verifying that the extracted path names a file and not a directory.
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