network: Remove HAVE_NM_UNSTABLE check

We don't have any code that relies on it anymore.

https://bugzilla.gnome.org/show_bug.cgi?id=747443

configure.ac

@@ -213,13 +213,6 @@ if test x${have_networkmanager} = xyes; then
   AC_SUBST(NM_VPN_MODULE_DIR)
 fi
 
-# Work-around for https://bugzilla.gnome.org/show_bug.cgi?id=723769
-PKG_CHECK_MODULES(NM_UNSTABLE_CHECK, libnm-util >= 0.9.9.0, nm_unstable=yes, nm_unstable=no)
-if test x$nm_unstable = xyes; then
-  AC_DEFINE(HAVE_NM_UNSTABLE, 1, [Define to 1 if NetworkManager is available])
-fi
-AM_CONDITIONAL(HAVE_NM_UNSTABLE, [test x$nm_unstable = xyes])
-
 # Check for gnome-bluetooth
 PKG_CHECK_MODULES(BLUETOOTH, $COMMON_MODULES gnome-bluetooth-1.0 >= 3.18.2,
 		  [have_bluetooth=yes], have_bluetooth=no)

panels/network/cc-network-panel.c

@@ -1220,11 +1220,9 @@ add_connection (CcNetworkPanel *panel,
         if (g_strcmp0 (type, "vpn") != 0 && iface == NULL)
                 return;
 
-#ifdef HAVE_NM_UNSTABLE
         /* Don't add the libvirtd bridge to the UI */
         if (g_strcmp0 (nm_setting_connection_get_interface_name (s_con), "virbr0") == 0)
                 return;
-#endif
 
         g_debug ("add %s/%s remote connection: %s",
                  type, g_type_name_from_instance ((GTypeInstance*)connection),