[gnome-builder] tests: add missing #include

[Sébastien Lafargue <slafargue src gnome org>]

commit 23e51e7de1754c34988c2d00115b893723c4ae93
Author: Sebastien Lafargue <slafargue gnome org>
Date:   Thu Feb 25 18:33:59 2016 +0100

    tests: add missing #include

 tests/test-ide-indenter.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/tests/test-ide-indenter.c b/tests/test-ide-indenter.c
index 610917f..f4d2654 100644
--- a/tests/test-ide-indenter.c
+++ b/tests/test-ide-indenter.c
@@ -18,6 +18,7 @@
 
 #include <libpeas/peas.h>
 #include <ide.h>
+#include "util/ide-gdk.h"
 #include <string.h>
 
 #include "ide-application-tests.h"