ports/147156: fix build: audio/musepack

[shaun at FreeBSD.org]

Synopsis: fix build: audio/musepack

Responsible-Changed-From-To: freebsd-ports-bugs->shaun
Responsible-Changed-By: shaun
Responsible-Changed-When: Sat May 29 01:05:28 UTC 2010
Responsible-Changed-Why: 
Grab.

http://www.freebsd.org/cgi/query-pr.cgi?pr=147156