Log Message:
Update "libtorrent" package to version 0.11.9 and "rtorrent" \ 
package
to version 0.7.9. Changes since 0.11.8 respectively 0.7.8:
- Improved detection of unnecessary handshakes to decrease the load when
  using PEX.
- Limit the number of PEX connections to 8 per download.
- Fixed several bugs in PEX.
- Fixed several sigc++ 2.1 compile errors.
- Print to the log when close_on_diskspace gets triggered.

This is not a stable version. The update was however necessary after
the premature update of the "libsigc++" package which broke the build
of these packages.