rtorrent: bump to version 0.9.6

- Bump to version 0.9.6

- Add a hash file.

- Change the website URL to the new official one.

- Tweak the 0001-cross_compile.patch for the new version.

Signed-off-by: Vicente Olivert Riera <Vincent.Riera@imgtec.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>