[gfortran,patch] Correctly NULL-terminate character constant strings

[François-Xavier Coudert]

:ADDPATCH fortran:

Hi all,

Attached patch corrects a few functions which did not correctly
NULL-terminate value.character.string for CHARACTER constants.
Although it appears that this NULL-termination was not required when
the front-end was first written, a few places now rely on it, and I
don't think it's too bad to accomodate them. I've tried to review and
fix not only the problem in the original PR, but all other such
places.

OK for mainline, 4.2 and 4.1?

FX
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