inetutils: define PATH_PROCNET_DEV if not already defined

this prevents the following compilation error :
system/linux.c:401:15: error: 'PATH_PROCNET_DEV' undeclared (first use in this function)

this patch comes from :
 http://repository.timesys.com/buildsources/i/inetutils/inetutils-1.9/

Upstream-Status: Inappropriate [not author]

Signed-of-by: Eric Bénard <eric@eukrea.com>
---
diff -Naur inetutils-1.9.orig/ifconfig/system/linux.c inetutils-1.9/ifconfig/system/linux.c
--- inetutils-1.9.orig/ifconfig/system/linux.c	2012-01-04 16:31:36.000000000 -0500
+++ inetutils-1.9/ifconfig/system/linux.c	2012-01-04 16:40:53.000000000 -0500
@@ -49,6 +49,10 @@
 #include "../ifconfig.h"
 
 
+#ifndef PATH_PROCNET_DEV
+  #define PATH_PROCNET_DEV "/proc/net/dev"
+#endif
+
 /* ARPHRD stuff.  */
 
 static void