[gtk+] Add missing single-include guards

[Michael Natterer <mitch src gnome org>]

commit 1e476186cbbc64340b89f76db96fb49957739112
Author: Michael Natterer <mitch gimp org>
Date:   Fri Nov 27 15:58:13 2009 +0100

    Add missing single-include guards

 gtk/gtktoolitemgroup.h |    4 ++++
 gtk/gtktoolpalette.h   |    4 ++++
 2 files changed, 8 insertions(+), 0 deletions(-)
---
diff --git a/gtk/gtktoolitemgroup.h b/gtk/gtktoolitemgroup.h
index 4a1b9b4..82f153c 100644
--- a/gtk/gtktoolitemgroup.h
+++ b/gtk/gtktoolitemgroup.h
@@ -19,6 +19,10 @@
  *      Mathias Hasselmann
  */
 
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
 #ifndef __GTK_TOOL_ITEM_GROUP_H__
 #define __GTK_TOOL_ITEM_GROUP_H__
 
diff --git a/gtk/gtktoolpalette.h b/gtk/gtktoolpalette.h
index 36eb379..e45b9a1 100644
--- a/gtk/gtktoolpalette.h
+++ b/gtk/gtktoolpalette.h
@@ -19,6 +19,10 @@
  *      Mathias Hasselmann
  */
 
+#if !defined (__GTK_H_INSIDE__) && !defined (GTK_COMPILATION)
+#error "Only <gtk/gtk.h> can be included directly."
+#endif
+
 #ifndef __GTK_TOOL_PALETTE_H__
 #define __GTK_TOOL_PALETTE_H__