build: Add upower as dependency in moduleset

Now that we use it to suspend, we need to pull it
in during the build process.

https://bugzilla.gnome.org/show_bug.cgi?id=636680

tools/build/gnome-shell.modules

@@ -279,6 +279,20 @@
     </suggests>
   </tarball>
 
+  <tarball autogenargs="--enable-introspection=no" id="upower" version="0.9.8">
+    <source href="http://upower.freedesktop.org/releases/upower-0.9.8.tar.bz2"
+            hash="sha256:7afaec3cb10ebbc898308c7abd250c27fd58e10379a42e80444d7a4b32f2eb91"
+            size="462754"/>
+    <dependencies>
+      <dep package="polkit"/>
+      <dep package="dbus-glib"/>
+    </dependencies>
+    <suggests>
+      <dep package="gobject-introspection"/>
+      <dep package="gudev"/>
+    </suggests>
+  </tarball>
+
   <autotools id="libnotify">
     <branch repo="git.gnome.org" module="libnotify"/>
     <dependencies>