- Update to 1.6.0-beta7
    - The Asterisk tarball no longer contains the iLBC code, so we can directly
        use the upstream tarball without having to modify it.
    - Get rid of the asterisk-strip.sh script since it's no longer needed.
    - Diable build of codec_ilbc and format_ilbc (these do not contain any
        legally suspect code so they can be included in the tarball but it's
        pointless building them).
    - Update chan_mobile patch to fix API breakages.
    - Add a patch to chan_usbradio to fix API breakages.