[PATCH] Fortran: reject module variable as character length in PARAMETER [PR104349]

[Harald Anlauf]

Dear all,

the attached patch fixes an ICE-on-invalid for a PARAMETER expression
where the character length was a MODULE variable.  The ICE seemed
strange, as we were catching related erroneous code for declarations in
programs or subroutines.  Removing a seemingly bogus check of restricted
expressions is the simplest way to fix this.  (We could also catch this
differently in decl.cc).

Besides, this also fixes an accepts-invalid, see testcase. :-)

Regtested on x86_64-pc-linux-gnu.  OK for mainline (13) or rather wait?

Thanks,
Harald

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