Port OpenSSL to sockets

Summary: Added another line to the rsys sample app's `main.cpp`, which forced me to enable sockets and fix errors in order to get it compile and link.

Reviewed By: usikder

Differential Revision: D30192527

fbshipit-source-id: 10eb9714900ca7f7a48c11b5d8308558ca5e8208

folly/net/NetOps.h

@@ -121,11 +121,6 @@ struct mmsghdr {
   unsigned int msg_len;
 };
 
-struct sockaddr_un {
-  sa_family_t sun_family;
-  char sun_path[108];
-};
-
 #define SHUT_RDWR 5
 
 #else