[NETLINK]: Add properly module refcounting for kernel netlink sockets.

- Remove bogus code for compiling netlink as module
- Add module refcounting support for modules implementing a netlink
  protocol
- Add support for autoloading modules that implement a netlink protocol
  as soon as someone opens a socket for that protocol

Signed-off-by: Harald Welte <laforge@netfilter.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/net.h b/include/linux/net.h
index 20cb226..3990661 100644
--- a/include/linux/net.h
+++ b/include/linux/net.h
@@ -282,5 +282,8 @@
 #define MODULE_ALIAS_NETPROTO(proto) \
 	MODULE_ALIAS("net-pf-" __stringify(proto))
 
+#define MODULE_ALIAS_NET_PF_PROTO(pf, proto) \
+	MODULE_ALIAS("net-pf-" __stringify(pf) "-proto-" __stringify(proto))
+
 #endif /* __KERNEL__ */
 #endif	/* _LINUX_NET_H */