gstreamer windows: don't build libtheora's examples

Because they don't support libpng 1.6.
windows: prepare paths for pkg-config
Bump version

2.0.1 ->
2.0.2
Add Clutter-GStreamer
pango: add prototype declarations
Various bug fixes for Ruby-1.9 or later.
Merge branch 'master' of github.com:fukuchi/ruby-gnome2