Outdated code in demos/perl/GMP/Mpf.pm

[Rob]

Please see the attached patch to fix these Perl warnings:

overload arg 'not' is invalid at /usr/local/lib64/perl5/GMP/Mpf.pm line 47.
$# is no longer supported at /usr/local/lib64/perl5/GMP/Mpf.pm line 86.

Thanks,
Rob
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