[gtk+] rendericon: Add missing include

[Benjamin Otte <otte src gnome org>]

commit 1da8c1b27fd968e6aa69be465393c4490272e833
Author: Benjamin Otte <otte redhat com>
Date:   Fri Nov 10 15:04:13 2017 +0100

    rendericon: Add missing include

 gtk/gtkrendericon.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtkrendericon.c b/gtk/gtkrendericon.c
index 620052a..77b80ba 100644
--- a/gtk/gtkrendericon.c
+++ b/gtk/gtkrendericon.c
@@ -27,6 +27,7 @@
 #include "gtkcssshadowsvalueprivate.h"
 #include "gtkcssstyleprivate.h"
 #include "gtkcsstransformvalueprivate.h"
+#include "gtkiconthemeprivate.h"
 #include "gtksnapshotprivate.h"
 
 #include <math.h>