This removes the "Do you want to checkout and build Clutter?" option
from the mingw-cross-compile.sh script and renames the script
mingw-fetch-dependencies.sh
As it stands the mingw-cross-compile.sh script isn't enough to fetch all
the dependencies for building clutter, since Tor doesn't provide binaries
for json-glib so the option to checkout and build clutter can't work.
Also it doesn't seem ideal to clone a fresh clutter repo instead of
being able to compile the source of the current repo.
The README has been updated to say that you can use the script under
MSYS and also to contain a pointer to OAH. It also contains the
updated contents of a blog post¹ about building with MSYS.
1. http://www.busydoingnothing.co.uk/blog/2008/07/13#ClutterWin32
