Add libgsystem, a runtime dep that configure doesn't check for

PKGBUILD

@@ -3,7 +3,7 @@
 
 pkgname=gnome-shell
 pkgver=3.14.3
-pkgrel=1
+pkgrel=2
 pkgdesc="The next generation GNOME Shell"
 arch=(i686 x86_64)
 url="http://live.gnome.org/GnomeShell"
@@ -11,7 +11,7 @@ license=(GPL2)
 depends=(accountsservice caribou gcr gjs gnome-bluetooth gnome-menus upower
          gnome-session gnome-settings-daemon gnome-themes-standard gsettings-desktop-schemas
          libcanberra-pulse libcroco libgdm libsecret mutter network-manager-applet
-         telepathy-logger telepathy-mission-control unzip gstreamer)
+         telepathy-logger telepathy-mission-control unzip gstreamer libgsystem)
 makedepends=(intltool gtk-doc gnome-control-center evolution-data-server)
 optdepends=('gnome-control-center: System settings'
             'evolution-data-server: Evolution calendar integration')