Include an extra header needed for OpenBSD.

AUTHORS

@@ -262,6 +262,7 @@ Patches have also been contributed by:
   Stefan Hajnoczi      <stefanha@linux.vnet.ibm.com>
   Gene Czarcinski      <gene@czarc.net>
   Nishank Trivedi      <nistrive@cisco.com>
+  Jasper Lievisse Adriaanse <jasper@humppa.nl>
 
   [....send patches to get your name here....]
 

src/util/virnetdevbridge.c

@@ -30,6 +30,8 @@
 #include "intprops.h"
 
 #include <sys/ioctl.h>
+#include <sys/socket.h>
+
 #ifdef HAVE_NET_IF_H
 # include <net/if.h>
 #endif