ports/174493: Fix sysutils/gnome-system-tools compliing with clang

[edwin at FreeBSD.org]

Synopsis: Fix sysutils/gnome-system-tools compliing with clang

Responsible-Changed-From-To: freebsd-ports-bugs->gnome
Responsible-Changed-By: edwin
Responsible-Changed-When: Mon Dec 17 01:40:14 UTC 2012
Responsible-Changed-Why: 
Over to maintainer (via the GNATS Auto Assign Tool)

http://www.freebsd.org/cgi/query-pr.cgi?pr=174493