auto-multiple-choice: sync PERL5LIB and buildInputs

The list of perl packages appeared twice in the package definition, but wasn't
kept properly synchronized: NetCUPS was added only to the PERL5LIB path in the
wrapper, and without this auto-multiple-choice wasn't finding it (trying to
print displayed the same error message as without NetCUPS at all).

This also adds OpenOfficeOODoc and HashMerge which were apparently forgotten in
buildInputs.

While we're there, use the more standard perl.withPackages to get a perl
interpreter with the right modules available instead of handcrafting our
$PERL5LIB path.

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