um: get rid of pointless include "..." where include <...> will do

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Richard Weinberger <richard@nod.at>
diff --git a/arch/um/drivers/pcap_user.h b/arch/um/drivers/pcap_user.h
index d8ba615..1ca7c76 100644
--- a/arch/um/drivers/pcap_user.h
+++ b/arch/um/drivers/pcap_user.h
@@ -3,7 +3,7 @@
  * Licensed under the GPL
  */
 
-#include "net_user.h"
+#include <net_user.h>
 
 struct pcap_data {
 	char *host_if;