[evince] Add access to pulseaudio sound server to flatpak.

[Germán Poo-Caamaño <gpoo src gnome org>]

commit e885ba4b897fe06ee17b430b078cd8005be21389
Author: Berteaux <michael berteaux live be>
Date:   Sat Jun 19 12:55:36 2021 +0000

    Add access to pulseaudio sound server to flatpak.

 build-aux/flatpak/org.gnome.Evince.json | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/build-aux/flatpak/org.gnome.Evince.json b/build-aux/flatpak/org.gnome.Evince.json
index c572800e..b86dc8a3 100644
--- a/build-aux/flatpak/org.gnome.Evince.json
+++ b/build-aux/flatpak/org.gnome.Evince.json
@@ -13,6 +13,7 @@
         "--share=ipc",
         "--socket=x11",
         "--socket=wayland",
+        "--socket=pulseaudio",
         "--filesystem=host",
         "--talk-name=org.gnome.SettingsDaemon.MediaKeys",
         "--filesystem=xdg-run/dconf",