ports/169010: unbreak audio/libmtp on 7.x

[cs at FreeBSD.org]

Synopsis: unbreak audio/libmtp on 7.x

Responsible-Changed-From-To: freebsd-ports-bugs->cs
Responsible-Changed-By: cs
Responsible-Changed-When: Tue Jun 12 20:31:43 UTC 2012
Responsible-Changed-Why: 
I'll take it.

http://www.freebsd.org/cgi/query-pr.cgi?pr=169010