gvc: Update submodule

gnome-volume-control now has API to expose the stream state, which
we will need in the following commit.

https://gitlab.gnome.org/GNOME/gnome-shell/issues/53
This commit is contained in:
Florian Müllner
2019-11-22 18:37:25 +01:00
parent a8005e3c30
commit c506eda20a