[gtksourceview] gtksourceutils.c: Add missed config.h include

[Chun-wei Fan <fanchunwei src gnome org>]

commit 259f6b93b77dd4774791575f98c2be9294bdc673
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Mon Dec 28 16:45:49 2015 +0800

    gtksourceutils.c: Add missed config.h include
    
    Otherwise the public symbols won't get exported via the macros.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=759838

 gtksourceview/gtksourceutils.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)
---
diff --git a/gtksourceview/gtksourceutils.c b/gtksourceview/gtksourceutils.c
index bebe34f..afa0eab 100644
--- a/gtksourceview/gtksourceutils.c
+++ b/gtksourceview/gtksourceutils.c
@@ -20,6 +20,10 @@
  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  */
 
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
 /**
  * SECTION:utils
  * @title: GtkSourceUtils