depend on gnome-icon-theme or oxygen-icon-theme

It's necessary to make sure all the standard icons are available.

packaging/debian/control

@@ -15,8 +15,9 @@ Package: solaar
 Architecture: all
 Depends: ${misc:Depends}, udev (>= 175), adduser,
  ${python:Depends}, python-pyudev (>= 0.13), python-gi (>= 3.2), gir1.2-gtk-3.0 (>= 3.4),
+ ${DesktopIconTheme}
 Recommends: gir1.2-notify-0.7
-Suggests: gnome-icon-theme | gnome-icon-theme-full | oxygen-icon-theme | lxde-icon-theme | moblin-icon-theme | nuvola-icon-theme | xubuntu-icon-theme
+Suggests: gir1.2-gtk-3.0 (>= 3.6.4)
 Description: Logitech Unifying Receiver peripherals manager for Linux
  Solaar is a Linux device manager for Logitech's Unifying Receiver peripherals.
  It is able to pair/unpair devices to the receiver, and for some devices read

packaging/debian/rules

@@ -21,3 +21,6 @@ override_dh_python2:
 override_dh_installudev:
 	cp rules.d/??-logitech-unifying-receiver.rules debian/solaar.logitech-unifying-receiver.udev
 	dh_installudev --priority=99 --name=logitech-unifying-receiver
+
+override_dh_gencontrol:
+	dh_gencontrol -- -Tdebian/substvars.extra

packaging/debian/solaar.postinst

@@ -2,6 +2,8 @@
 
 set -e
 
+# shamelessly copied from usbmuxd.postinst
+
 # creating plugdev group if he isn't already there
 if ! getent group plugdev >/dev/null; then
 	addgroup --system plugdev

packaging/debian/substvars.extra

@@ -0,0 +1 @@
+DesktopIconTheme=gnome-icon-theme | oxygen-icon-theme

packaging/ubuntu/substvars.extra

@@ -0,0 +1 @@
+DesktopIconTheme=gnome-icon-theme-full | oxygen-icon-theme-complete