[gtk+] Fix the build with --enable-gtk2-dependency

[matthiasc src gnome org]

commit 3067ef4a9b9fd51441dafcf05b6e0513d709df40
Author: Matthias Clasen <mclasen redhat com>
Date:   Wed Feb 2 01:30:21 2011 -0500

    Fix the build with --enable-gtk2-dependency

 gtk/Makefile.am |    2 ++
 1 files changed, 2 insertions(+), 0 deletions(-)
---
diff --git a/gtk/Makefile.am b/gtk/Makefile.am
index f4dfbe4..535ecc8 100644
--- a/gtk/Makefile.am
+++ b/gtk/Makefile.am
@@ -1342,7 +1342,9 @@ gtk_update_icon_cache_program = ./gtk-update-icon-cache
 endif
 
 gtkbuiltincache.h: @REBUILD@ stamp-icons
+if !USE_EXTERNAL_ICON_CACHE
 	$(AM_V_at) $(MAKE) $(AM_MAKEFLAGS) gtk-update-icon-cache$(EXEEXT) $(GTK_UPDATE_ICON_CACHE_MANIFEST)
+endif
 	$(AM_V_GEN) $(gtk_update_icon_cache_program) --quiet --force --ignore-theme-index		\
 	   --source builtin_icons stock-icons > gtkbuiltincache.h.tmp &&        \
 	mv gtkbuiltincache.h.tmp gtkbuiltincache.h