[patch, fortran] New take on PR 82373

[Thomas Koenig]

Hello world,

after some thought, I think the PR can be fixed by something
far less invasive than my previous patch.

The new version of the patch simply issues an error for a
non-printable character (which should never be legal).
Anything else should be caught by other error reporting
routines.

OK for trunk?

Regards

	Thomas

2017-10-12  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/82372
         * fortran/scanner.c (last_error_char):  New global variable.
         (gfc_scanner_init_1): Set last_error_char to NULL.
         (gfc_gooble_whitespace): If a character not printable or
         not newline, issue an error.

2017-10-12  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/82372
         * gfortran.dg/illegal_char.f90: New test.
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