uml: make pcap driver compile again
From: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>

Fix this error:
arch/um/drivers/pcap_user.c:124: error:  conflicting type qualifiers for ‘pcap_user_info’
arch/um/drivers/pcap_user.h:18: error: previous declaration of ‘pcap_user_info’ was here

the definition recently became const.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Index: linux-2.6.git/arch/um/drivers/pcap_user.h
===================================================================
--- linux-2.6.git.orig/arch/um/drivers/pcap_user.h
+++ linux-2.6.git/arch/um/drivers/pcap_user.h
@@ -15,7 +15,7 @@ struct pcap_data {
 	void *dev;
 };
 
-extern struct net_user_info pcap_user_info;
+extern const struct net_user_info pcap_user_info;
 
 extern int pcap_user_read(int fd, void *buf, int len, struct pcap_data *pri);