[PATCH, Fortran] PR 79968: merge similar diagnostics containing -fdec-structure

[Fritz Reese]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=79968

All,

The PR suggests unifying diagnostics of the form "%s at %C is a DEC
extension, enable with ..." I think the patch is obvious/trivial and
speaks for itself. I plan to commit the attached to trunk shortly,
barring any complaints.

(Nb. even with the change in diagnostics, the applicable testcases
(dec_io_3.f90 and dec_static_3.f90) are not regressed as they match
only the "is a DEC extension" portion of the error message.)

---
Fritz Reese

2017-05-17  Fritz Reese <fritzoreese@gmail.com>

    PR fortran/79968

    gcc/fortran/ChangeLog:

        PR fortran/79968
        * decl.c (match_attr_spec, gfc_match_automatic,
        gfc_match_static, gfc_match_structure_decl): Unify diagnostic
        errors regarding -fdec options.
        * io.c (match_dec_etag, match_dec_vtag, match_dec_ftag): Ditto.
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