Map Linux SO_TIMESTAMP to FreeBSD in ff_syscall_wrapper

Add LINUX_SO_TIMESTAMP (29) to the socket option translation table so
that applications using the Linux syscall wrapper can enable packet
receive timestamps via setsockopt(fd, SOL_SOCKET, SO_TIMESTAMP, ...).

Author: tarun-t

lib/ff_syscall_wrapper.c

@@ -80,6 +80,7 @@
 #define LINUX_SO_SNDLOWAT     19
 #define LINUX_SO_RCVTIMEO     20
 #define LINUX_SO_SNDTIMEO     21
+#define LINUX_SO_TIMESTAMP    29
 #define LINUX_SO_ACCEPTCONN   30
 #define LINUX_SO_PROTOCOL     38
 
@@ -566,6 +567,8 @@ so_opt_convert(int optname)
             return SO_ACCEPTCONN;
         case LINUX_SO_PROTOCOL:
             return SO_PROTOCOL;
+        case LINUX_SO_TIMESTAMP:
+            return SO_TIMESTAMP;
         default:
             return -1;
     }