ports/187304: multimedia/libvpx: allow building with zsh

[edwin at FreeBSD.org]

Synopsis: multimedia/libvpx: allow building with zsh

Responsible-Changed-From-To: freebsd-ports-bugs->ashish
Responsible-Changed-By: edwin
Responsible-Changed-When: Wed Mar 5 21:30:08 UTC 2014
Responsible-Changed-Why: 
Over to maintainer (via the GNATS Auto Assign Tool)

http://www.freebsd.org/cgi/query-pr.cgi?pr=187304