misc: Make build on macOS work

util/socketset/socketset.go

@@ -15,6 +15,8 @@
 // You should have received a copy of the GNU General Public License
 // along with this program.  If not, see <http://www.gnu.org/licenses/>.
 
+// +build !darwin
+
 // Package socketset is in API for creating a select style netlink socket to
 // receive events from the kernel.
 package socketset