[gnome-control-center/gnome-3-34] sound: Remove leftover canberra-gtk header inclusion

[Robert Ancell <rancell src gnome org>]

commit 1fb8edb9c3734ce108388304af221188be79c400
Author: Mart Raudsepp <leio gentoo org>
Date:   Fri Sep 20 08:37:42 2019 +0300

    sound: Remove leftover canberra-gtk header inclusion
    
    This may fail to build too, as we don't depend on canberra-gtk anymore,
    and gsound only depends on canberra, not canberra-gtk.

 panels/sound/cc-volume-slider.c | 1 -
 1 file changed, 1 deletion(-)
---
diff --git a/panels/sound/cc-volume-slider.c b/panels/sound/cc-volume-slider.c
index 9f0610f63..98541e98a 100644
--- a/panels/sound/cc-volume-slider.c
+++ b/panels/sound/cc-volume-slider.c
@@ -20,7 +20,6 @@
 #include <math.h>
 #include <pulse/pulseaudio.h>
 #include <gvc-mixer-control.h>
-#include <canberra-gtk.h>
 
 #include "cc-sound-resources.h"
 #include "cc-volume-slider.h"