[PATCH] Fix typos in bsd.port.mk and minor logic improvements

[perryh at pluto.rain.com]

Doug Barton <dougb at freebsd.org> wrote:
> > -# UNAUTHORISED CHANGES WILL BE UNCONDITIONALLY REVERTED!
> > +# UNAUTHORIZED CHANGES WILL BE UNCONDITIONALLY REVERTED!
> ... The above is not a typo, that's the British spelling.
> ... (Arguably it adds character to the project.) :)

Er, this example just changes one character without adding any :)

[ducks]