bzip2: install shared library for the host

libbz2.so was explicitly built for the host, but was not installed. Install it.

Signed-off-by: David Bachelart <david.bachelart@bbright.com>
Acked-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>