buildroot

package/lzo: enable shared/static libs when needed

In 61c4c63 (package/lzo: switch to cmake), building lzo has switched
from autotools to cmake. In the conversion, we've lost the build of the
shared library, because the cmake-based buildsystem of lzo explcitly
disables it by default.

Restore the shared library build.

Signed-off-by: "Yann E. MORIN" <yann.morin.1998@free.fr>
Cc: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>