[patch, fortran] Fix character parameter arrays as formats

[Thomas Koenig]

Hello world,

the attached pach fixes the PR by creating one single big string
from a parameter array.

OK for trunk?

Regards

	Thomas

2018-03-25  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/66709
         * io.c: Include constructor.h.
         (resolve_tag_format): For a constant character array, concatenate
         into a single character expression.

2018-03-25  Thomas Koenig  <tkoenig@gcc.gnu.org>

         PR fortran/66709
         * gfortran.dg/parameter_array_format.f90: New test.
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