[PATCH] Fix allnoconfig compile with gcc 4 (take 2)

[mikukkon@iki.fi]

With allnoconfig and gcc 4 from SUSE 10 RC1:
	gcc version 4.0.2 20050901 (prerelease) (SUSE Linux)
I get following error:
  CC      init/main.o
In file included from include/linux/netdevice.h:29,
		 from include/net/sock.h:48,
		 from init/main.c:50:
include/linux/if_ether.h:114: error: array type has incomplete element type

Fixed by surrounding offending line with #ifdef CONFIG_SYSCTL as
discussed.

When I turned CONFIG_NET and CONFIG_SYSCTL on, I noticed also that
net/sysctl_net.c should #include <net/sock.h> unconditionally to avoid
similar error with core_table[] (also fixed in following patch).

Signed-of-by: Mika Kukkonen <mikukkon@iki.fi>

Index: linux-2.6/net/sysctl_net.c
===================================================================
--- linux-2.6.orig/net/sysctl_net.c
+++ linux-2.6/net/sysctl_net.c
@@ -15,6 +15,7 @@
 #include <linux/config.h>
 #include <linux/mm.h>
 #include <linux/sysctl.h>
+#include <net/sock.h>
 
 #ifdef CONFIG_INET
 #include <net/ip.h>
Index: linux-2.6/include/linux/if_ether.h
===================================================================
--- linux-2.6.orig/include/linux/if_ether.h
+++ linux-2.6/include/linux/if_ether.h
@@ -111,7 +111,10 @@ static inline struct ethhdr *eth_hdr(con
 	return (struct ethhdr *)skb->mac.raw;
 }
 
+#ifdef CONFIG_SYSCTL
 extern struct ctl_table ether_table[];
 #endif
 
+#endif
+
 #endif	/* _LINUX_IF_ETHER_H */
-
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