Add sound ports necessary for Skype 4.3
- audio/linux-c6-pulseaudio-libs
- audio/linux-c6-pulseaudio-utils
- audio/linux-c6-alsa-plugins-pulseaudio
- audio/linux-c6-flac
- audio/linux-c6-libsndfile
- dns/linux-c6-libasyncdns
- net/linux-c6-tcp_wrappers-libs
Mk/bsd.linux-apps.mk: amend and add appslist.