* commit '1818a640':
  build: Fix dependencies for alsa/jack/sndio support

Added explicit enable (which will be automatically added later on in
ee480790) to actually fix this commit. Without the explicit enables,
alsa, jack and sndio gets disabled.

Also added jack, alsa and sndio to the have list so the HAVE_* are
populated to make (this fixes the SKIPHEADERS chunks).
Merged-by: Clément Bœsch <u@pkh.me>