RFC: let man(1) depend on users PATH?

Greetings,

the following patch is required to let man(1) continue to work if the
user build WITHOUT_GROFF and has textproc/groff installed. I personally
think relying on a sane $PATH while calling groff and co is ok to do.

If there are good reasons against this, please speak your mind. The idea
is to be able to switch back and forth between base/ports groff-suite
without having to alter any configuration files.

Cheers,
Uli