ports/147156: fix build: audio/musepack

[Stefan Ehmann]

The following reply was made to PR ports/147156; it has been noted by GNATS.

From: Stefan Ehmann <shoesoft at gmx.net>
To: bug-followup at freebsd.org
Cc:  
Subject: Re: ports/147156: fix build: audio/musepack
Date: Fri, 28 May 2010 15:31:39 +0200

 I just noticed that the newly provided library conflicts with audio/libmpcdec. 
 The following files are installed by both ports:
 /usr/local/lib/libmpcdec.a
 /usr/local/lib/libmpcdec.la
 /usr/local/lib/libmpcdec.so
 
 I guess adding mutual CONFLICTS is necessary.