ports/165144: Update port: x11-wm/dwm to 6.0

[jgh at FreeBSD.org]

Synopsis: Update port: x11-wm/dwm to 6.0

Responsible-Changed-From-To: freebsd-ports-bugs->jgh
Responsible-Changed-By: jgh
Responsible-Changed-When: Tue Feb 14 17:27:34 UTC 2012
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=165144