libglu: new package

This package is needed for OpenGL support in xbmc:
https://github.com/xbmc/xbmc/blob/Gotham/configure.in#L1070

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
diff --git a/package/Config.in b/package/Config.in
index 5886cfa..c1de39c 100644
--- a/package/Config.in
+++ b/package/Config.in
@@ -618,6 +618,7 @@
 	source "package/libgail/Config.in"
 	source "package/libgeotiff/Config.in"
 	source "package/libglade/Config.in"
+	source "package/libglu/Config.in"
 	source "package/libgtk2/Config.in"
 	source "package/libpng/Config.in"
 	source "package/libqrencode/Config.in"