ports/172388: fix dns/libidn with pkg in strict mode

[kwm at FreeBSD.org]

Synopsis: fix dns/libidn with pkg in strict mode

Responsible-Changed-From-To: freebsd-ports-bugs->kwm
Responsible-Changed-By: kwm
Responsible-Changed-When: Sat Oct 6 10:28:48 UTC 2012
Responsible-Changed-Why: 
grab

http://www.freebsd.org/cgi/query-pr.cgi?pr=172388