add SO_ATTACH_REUSEPORT_[CE]BPF socket options from linux v4.5

new socket options for setting classic or extended BPF program
for sockets in a SO_REUSEPORT group.  added in linux commit
538950a1b7527a0a52ccd9337e3fcd304f027f13

include/sys/socket.h

@@ -220,7 +220,8 @@ struct linger
 #define SO_INCOMING_CPU         49
 #define SO_ATTACH_BPF           50
 #define SO_DETACH_BPF           SO_DETACH_FILTER
-
+#define SO_ATTACH_REUSEPORT_CBPF 51
+#define SO_ATTACH_REUSEPORT_EBPF 52
 
 #ifndef SOL_SOCKET
 #define SOL_SOCKET      1