The access now open itself the following rar volumes (only if needed). This
also allows to support rar embeded in rar or using other protocals than file.

It has been broken since the rar modules have been modified to
support multiple files.
(cherry picked from commit 25262a5ae65b2ce815a938fc53bab0602944921f)
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>