[gnome-system-monitor] If NI_IDN is not defined, set it to 0.

[Chris KÃhl <chriskuehl src gnome org>]

commit 74ced4acf1f514e5a75b7e68f0e012d8bc869be1
Author: Antoine Jacoutot <ajacoutot openbsd org>
Date:   Tue Jun 14 23:51:28 2011 +0200

    If NI_IDN is not defined, set it to 0.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=652602

 src/openfiles.cpp |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/src/openfiles.cpp b/src/openfiles.cpp
index 1435e84..2911890 100644
--- a/src/openfiles.cpp
+++ b/src/openfiles.cpp
@@ -15,6 +15,10 @@
 #include "util.h"
 #include "settings-keys.h"
 
+#ifndef NI_IDN
+#define NI_IDN 0
+#endif
+
 enum
 {
 	COL_FD,