[Patch, Fortran] PR52101 Fix obsolescent warning

[Tobias Burnus]

gfortran warns (with -std=) for the obsolescence of
   character*5 ...
which is correct. However, it also warns when using
   character name*5
which is not (yet) obsolescent.

Fixed by the attached patch. In comment 5 you find Steve's version of 
the patch, which I only saw after writing my patch. The only difference 
seems to be the name of the parameter. Steve uses "entity_decl".

Build and regtested on x86-64-gnu-linux.
OK for the trunk?

Tobias
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