treewide: mark selected packages nonshared

treewide: mark selected packages nonshared

Mark uci, ubus, libubox, lua, libnl-tiny and libjson-c
as nonshared packages. This helps to keep coherent dependencies
if these ABI versioned packages are later updated.

Before this commit it is possible to get missing dependencies
in target-specific nonshared packages (like iwinfo) that depend
on these shared ABI versioned packages. If these are later updated
and rebuilt, only the new ABI version will be available for download,
while the target-specific packages in releases continue to depend on
the old ABI version.

After this commit the packages are built along the other nonshared
packages by the phase1 images buildbot and will be available at the
target/ download directories instead of packages/base dir. That will
help to keep a coherent set available.

Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>