[gtk+] Add missing include for setlocale

[Paolo Borelli <pborelli src gnome org>]

commit bd07845c3127bac662ed019677be8f6fbe50a663
Author: Paolo Borelli <pborelli gnome org>
Date:   Sun Aug 3 11:53:56 2014 +0200

    Add missing include for setlocale

 gtk/encodesymbolic.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/encodesymbolic.c b/gtk/encodesymbolic.c
index 6f4ba57..c8e6700 100644
--- a/gtk/encodesymbolic.c
+++ b/gtk/encodesymbolic.c
@@ -30,6 +30,7 @@
 #endif
 #include <errno.h>
 #include <stdlib.h>
+#include <locale.h>
 
 static gchar *output_dir = NULL;