Explicitly enable zchunk so LRO_SUPPORTS_CACHEDIR works
Explicitly enable zchunk so LRO_SUPPORTS_CACHEDIR works

Signed-off-by: Jonathan Dieter <jdieter@gmail.com>

Closes: #777
Approved by: Conan-Kudo

hughsie/libhif,rpm-software-management/libdnf,hughsie/libhif,rpm-software-management/libhif,rpm-software-management/libhif,rpm-software-management/libhif,hughsie/libhif,rpm-software-management/libdnf,rpm-software-management/libhif,hughsie/libhif,rpm-software-management/libdnf,rpm-software-management/libdnf