gnome: add different avatar for conferences

Create avatar with two symbolic people to distinguish a conference.

Issue: #79076
Change-Id: Ie6b4b33af4d8fae2a188c23cb7cb5877bb64f199
diff --git a/src/utils/drawing.h b/src/utils/drawing.h
index dd8e54b..fd0881d 100644
--- a/src/utils/drawing.h
+++ b/src/utils/drawing.h
@@ -37,8 +37,10 @@
 
 GdkPixbuf *ring_draw_fallback_avatar(int size);
 
+GdkPixbuf *ring_draw_conference_avatar(int size);
+
 GdkPixbuf *ring_frame_avatar(GdkPixbuf *avatar);
 
 G_END_DECLS
 
-#endif /* _DRAWING */
\ No newline at end of file
+#endif /* _DRAWING */