Log message:
Add SHA512 digests for distfiles for audio category

Problems found with existing distfiles:
	/pub/pkgsrc/distfiles/amp-0.7.6.tgz
	/pub/pkgsrc/distfiles/freeswitch/freeswitch-sounds-music-32000-1.0.8.tar.gz
	/pub/pkgsrc/distfiles/freeswitch/freeswitch-sounds-music-48000-1.0.8.tar.gz
	/pub/pkgsrc/distfiles/freeswitch/freeswitch-sounds-en-us-callie-32000-1.0.22.tar.gz
	/pub/pkgsrc/distfiles/freeswitch/freeswitch-sounds-en-us-callie-48000-1.0.22.tar.gz
	/pub/pkgsrc/distfiles/freeswitch/freeswitch-sounds-fr-ca-june-32000-1.0.18.tar.gz
	/pub/pkgsrc/distfiles/freeswitch/freeswitch-sounds-fr-ca-june-48000-1.0.18.tar.gz
	/pub/pkgsrc/distfiles/freeswitch/freeswitch-sounds-ru-RU-elena-16000-1.0.12.tar.gz
	/pub/pkgsrc/distfiles/freeswitch/freeswitch-sounds-ru-RU-elena-32000-1.0.12.tar.gz
	/pub/pkgsrc/distfiles/freeswitch/freeswitch-sounds-ru-RU-elena-48000-1.0.12.tar.gz
	/pub/pkgsrc/distfiles/freeswitch/freeswitch-sounds-ru-RU-elena-8000-1.0.12.tar.gz
	/pub/pkgsrc/distfiles/freeswitch/freeswitch-sounds-fr-ca-june-32000-1.0.18.tar.gz
	/pub/pkgsrc/distfiles/freeswitch/freeswitch-sounds-fr-ca-june-48000-1.0.18.tar.gz
	/pub/pkgsrc/distfiles/freeswitch/freeswitch-sounds-ru-RU-elena-32000-1.0.13.tar.gz
	/pub/pkgsrc/distfiles/freeswitch/freeswitch-sounds-ru-RU-elena-48000-1.0.13.tar.gz
	/pub/pkgsrc/distfiles/kid3-3.3.0.tar.gz
	/pub/pkgsrc/distfiles/libdca-0.0.5.tar.bz2
	/pub/pkgsrc/distfiles/mp3to.gz
	/pub/pkgsrc/distfiles/squeezeboxserver-7.5.1-noCPAN.tgz
No changes made to these file.

Otherwise, existing SHA1 digests verified and found to be the same on
the machine holding the existing distfiles (morden).  All existing
SHA1 digests retained for now as an audit trail.

Log message:
Don't play attention to libmpcdec's extension, as it might be different on \ 
different platforms

Log message:
Import musepack-0rc475 as audio/musepack.

This is a speed and portability optimized version of Andree Buschmann's
MPEG-Plus decoder.