ports/181516: [ports/multimedia/ffmpeg] Fix build error with perl 5.18

[edwin at FreeBSD.org]

Synopsis: [ports/multimedia/ffmpeg] Fix build error with perl 5.18

Responsible-Changed-From-To: freebsd-ports-bugs->mm
Responsible-Changed-By: edwin
Responsible-Changed-When: Sun Aug 25 05:50:09 UTC 2013
Responsible-Changed-Why: 
Over to maintainer (via the GNATS Auto Assign Tool)

http://www.freebsd.org/cgi/query-pr.cgi?pr=181516