net engine: missing includes

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
diff --git a/engines/net.c b/engines/net.c
index 94bae95..0acd569 100644
--- a/engines/net.c
+++ b/engines/net.c
@@ -13,6 +13,8 @@
 #include <arpa/inet.h>
 #include <netdb.h>
 #include <sys/poll.h>
+#include <sys/types.h>
+#include <sys/socket.h>
 
 #include "../fio.h"