[Patch, Fortran] PR51308 - fix bogus c_null_ptr error

[Tobias Burnus]

gfortran printed an error that "c_null_ptr" couldn't be SAVE an 
PARAMETER at the same time; removing the SAVE attribute causes an error 
that a BIND(C) variable may not be a PARAMETER, thus that has to be 
fixed as well.
(Patch based on the one of Steven

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

Tobias
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