ports/78699: Update port: sysutils/du2ps

[Yoshihiko Sarumaru]

> State-Changed-Why: 
> Committed with modifications, thanks!
> I modified it a bit so it confirms a bit more to our style.

I also wrote in such style at the first time, but in my
environment, it makes some problems with NOPORTDOCS.
Don't we need take care of theses?

shimako# make install -DNOPORTDOCS
(snip)
@echo: not found
@echo: not found
@echo: not found
@echo: not found
@echo: not found

shimako# pkg_delete /var/db/pkg/du2ps-3.1
pkg_delete: file '/usr/local/share/doc/du2ps' doesn't really exist
pkg_delete: unable to completely remove directory '/usr/local/share/doc/du2ps'
pkg_delete: couldn't entirely delete package (perhaps the packing list is
incorrectly specified?)

--
Yoshihiko Sarumaru