Rename the -W option to -p (mnemonics: picky, print to stderr):

Rename the -W option to -p (mnemonics: picky, print to stderr):
That letter was already chosen by espie@ for OpenBSD 2.7,
so avoid being gratuitiously different more than a decade later.
Accept -v for backward compatibility with espie@'s makewhatis,
even though it does nothing right now.