Always include <sys/socket.h> before <linux/netlink.h>.
Newer kernel headers files aren't stand alone. (This has long been true of
glibc's copy, but we only recently updated external/kernel-headers.)
Change-Id: Iebcb40902b2f29fe509e207e2f3a9d02a7e40602
diff --git a/libnl_2/msg.c b/libnl_2/msg.c
index 283da6e..1303e8a 100644
--- a/libnl_2/msg.c
+++ b/libnl_2/msg.c
@@ -18,6 +18,7 @@
#include <malloc.h>
#include <unistd.h>
+#include <sys/socket.h>
#include <linux/netlink.h>
#include "netlink-types.h"