net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules

These files are non modular, but need to export symbols using
the macros now living in export.h -- call out the include so
that things won't break when we remove the implicit presence
of module.h from everywhere.

Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
diff --git a/net/ipv4/syncookies.c b/net/ipv4/syncookies.c
index d7b89b1..90f6544 100644
--- a/net/ipv4/syncookies.c
+++ b/net/ipv4/syncookies.c
@@ -15,6 +15,7 @@
 #include <linux/random.h>
 #include <linux/cryptohash.h>
 #include <linux/kernel.h>
+#include <linux/export.h>
 #include <net/tcp.h>
 #include <net/route.h>