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

[b. f.]

>So I'm taking it that the only change of benefit is the attached patch.

While you are there, you might also:

line 150: s/supercede/supersede/
line 764: s/dependancies/dependencies/
line 2982: s/everthing/everything/
line 6142: s/servicable/serviceable/

b.