rsync: bump version

Bump version to 3.0.6.
autoreconf is off per default, so no need to specify it.
Use config.cache (fix the incorrect package instead).
Pass ENABLE_DEBUG setting to configure.

Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>
Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>