This is needed in order for asterisk to find the sound files we provide
(and I found adding a symlink from the sounds dir to /var/lib/asterisk/
being just too ugly). As it changes only the default configuration, I
guess this is fine without increasing PKG_RELEASE.
But as there are packages with names containing them, and other package
managers probably have less problems with that, fix this issue at the
most specific place.
