ports/156807: print/xfce4-print: fix dependency on libcups

[edwin at FreeBSD.org]

Synopsis: print/xfce4-print: fix dependency on libcups

Responsible-Changed-From-To: freebsd-ports-bugs->oliver
Responsible-Changed-By: edwin
Responsible-Changed-When: Wed May 4 06:00:39 UTC 2011
Responsible-Changed-Why: 
Over to maintainer (via the GNATS Auto Assign Tool)

http://www.freebsd.org/cgi/query-pr.cgi?pr=156807