mktables -- don't create Names table unless asked

mktables -- don't create Names table unless asked

This speeds up mktables by not creating the Names table unless asked to,
by someone adding it to the list of tables to be output.  Perl uses a
different table than this one for charnames, so the one being suppressed
isn't generally used.  Previously it was created but not output.  Now,
we skip the useless creation step.