Revert "network: Allow compiling against NM 0.9.6"

This reverts commit ec704ab62f.

This will effectively bump again the NM requirement to 0.9.7.995.

panels/network/connection-editor/net-connection-editor.c

@@ -584,9 +584,7 @@ typedef struct {
 static const NetConnectionType connection_types[] = {
         { N_("VPN"), nm_setting_vpn_get_type },
         { N_("Bond"), nm_setting_bond_get_type },
-#ifdef HAVE_NM_UNSTABLE
         { N_("Bridge"), nm_setting_bridge_get_type },
-#endif
         { N_("VLAN"), nm_setting_vlan_get_type }
 };
 static const NetConnectionType *vpn_connection_type = &connection_types[0];