Make the network headers compile standalone.

Bug: http://b/28067717
Change-Id: I0f69c6cba0eb0df2fe68f458ba5aa81fe8e6434c
diff --git a/libc/include/netinet/tcp.h b/libc/include/netinet/tcp.h
index 5601645..e95cc09 100644
--- a/libc/include/netinet/tcp.h
+++ b/libc/include/netinet/tcp.h
@@ -29,6 +29,8 @@
 #ifndef _NETINET_TCP_H
 #define _NETINET_TCP_H
 
+#include <sys/cdefs.h>
+
 #include <linux/tcp.h>
 
 __BEGIN_DECLS