* gnu/packages/pulseaudio.scm (pavucontrol): Fix icons.
[build-system]: Use glib-or-gtk-build-system instead of gnu-build-system.
[inputs]: Add adwaita-icon-theme. Re-order inputs.
Since the adwaita icon theme is hard-coded in the application, there is
no choice for the user anyway. So added adwaita-icon-theme to inputs and
changed build-system to glib-or-gtk to fix loading of icons.
5cca16968e