Flesh out WITHOUT_GROFF support to DTRT.
A full featured groff is required during buildworld, so build it always and don't rely on it being present on the host system.
vgrind(1) is tightly coupled to a roff processor and will not be built/installed when groff is disabled. Also much of the roff'ed documentation under share/doc will not be built/installed when WITHOUT_GROFF is defined.
Reviewed by: ru (partial)
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