Fix build error with gcc6:
../../gtksourceview-2.10.5/gtksourceview/gtksourceprintcompositor.c: In function 'strdup_strftime':
../../gtksourceview-2.10.5/gtksourceview/gtksourceprintcompositor.c:1951:3: error: format not a string literal, format string not checked [-Werror=format-nonliteral]
   tmplen = strftime (tmpbuf, tmpbufsize, locale_format, tm);
   ^~~~~~

Patch Reference:
https://git.gnome.org/browse/glib/commit/?id=0817af40e8c74c721c30f6ef482b1f53d12044c7
https://git.gnome.org/browse/glib/commit/?id=8cdbc7fb2c8c876902e457abe46ee18a0b134486

Upstream-Status: Pending
Signed-off-by: Yi Zhao <yi.zhao@windriver.com>

diff -Nurp gtksourceview-2.10.5.orig/gtksourceview/gtksourceprintcompositor.c gtksourceview-2.10.5/gtksourceview/gtksourceprintcompositor.c
--- gtksourceview-2.10.5.orig/gtksourceview/gtksourceprintcompositor.c	2016-07-01 13:11:43.631173762 +0800
+++ gtksourceview-2.10.5/gtksourceview/gtksourceprintcompositor.c	2016-07-04 13:54:18.223726343 +0800
@@ -1913,6 +1913,8 @@ setup_pango_layouts (GtkSourcePrintCompo
  * GLIB - Library of useful routines for C programming
  * Copyright (C) 1995-1997  Peter Mattis, Spencer Kimball and Josh MacDonald */
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wformat-nonliteral"
 static gchar *
 strdup_strftime (const gchar *format, const struct tm *tm)
 {
@@ -1982,6 +1984,7 @@ strdup_strftime (const gchar *format, co
 
 	return convbuf;
 }
+#pragma GCC diagnostic pop
 
 static gchar *
 evaluate_format_string (GtkSourcePrintCompositor *compositor,