[libgnome-volume-control] (6 commits) Non-fast-forward update to branch wip/muktupavels/warnings

[Alberts Muktupāvels <muktupavels src gnome org>]

The branch 'wip/muktupavels/warnings' was changed in a way that was not a fast-forward update.
NOTE: This may cause problems for people pulling from the branch. For more information,
please see:

 https://wiki.gnome.org/Git/Help/NonFastForward

Commits removed from the branch:

  7b778d0... build: ignore .dirstamp file
  5916095... mixer-control: fix -Wswitch-enum warnings
  c92c262... test-audio-device-selection: fix -Wsign-compare warning
  f13437e... test-audio-device-selection: fix -Wdiscarded-qualifiers war
  9d777c4... mixer-control: fix -Wsign-compare warnings

Commits added to the branch:

  e2be83e... build: Bump pulseaudio dependency (*)
  02cab4d... build: ignore .dirstamp file
  342e366... mixer-control: fix -Wswitch-enum warnings
  d8ba41f... test-audio-device-selection: fix -Wsign-compare warning
  1598085... test-audio-device-selection: fix -Wdiscarded-qualifiers war
  0aab80a... mixer-control: fix -Wsign-compare warnings

(*) This commit already existed in another branch; no separate mail sent