[gtkmm] Do not install gtkmm-demo data

[Murray Cumming <murrayc src gnome org>]

commit 75ed3b81ab473f60fe6112116d166e3708928cae
Author: Yaakov Selkowitz <yselkowitz users sourceforge net>
Date:   Wed Jun 16 02:27:08 2010 -0500

    Do not install gtkmm-demo data
    
    https://bugzilla.gnome.org/show_bug.cgi?id=621737

 demos/Makefile.am |    4 +---
 1 files changed, 1 insertions(+), 3 deletions(-)
---
diff --git a/demos/Makefile.am b/demos/Makefile.am
index aa52222..b71a8b4 100644
--- a/demos/Makefile.am
+++ b/demos/Makefile.am
@@ -49,9 +49,7 @@ gtk_demo_gtkmm_demo_SOURCES =				\
 	gtk-demo/textwidget.cc				\
 	gtk-demo/textwidget.h
 
-democodedir = $(datadir)/$(GTKMM_MODULE_NAME)/demo
-democode_DATA = $(gtk_demo_gtkmm_demo_SOURCES)
-dist_democode_DATA =			\
+dist_noinst_DATA =			\
 	gtk-demo/alphatest.png		\
 	gtk-demo/apple-red.png		\
 	gtk-demo/background.jpg		\