[yelp] Fix build breakage caused by the fix to https://bugzilla.gnome.org/show_bug.cgi?id=648840

[Shaun McCance <shaunm src gnome org>]

commit 5ba4aefb6d0c8b292d59833963070383cb539168
Author: Gabor Kelemen <kelemeng gnome hu>
Date:   Fri Apr 29 10:10:35 2011 +0200

    Fix build breakage caused by the fix to https://bugzilla.gnome.org/show_bug.cgi?id=648840

 src/yelp.c |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/src/yelp.c b/src/yelp.c
index 5c37b2a..6cf425b 100644
--- a/src/yelp.c
+++ b/src/yelp.c
@@ -24,6 +24,8 @@
 #include <config.h>
 #endif
 
+#include <locale.h>
+
 #include <glib.h>
 #include <glib/gi18n.h>
 #include <gtk/gtk.h>