Add readline support to PACKAGECONFIG. If readline needs if left out
of compilation, the bluez utilities which depend on readline are not
included in build or packages.
The defaults in PACKAGECONFIG are the same as before, so there should be
no change to current users.
Signed-off-by: Ismo Puustinen <ismo.puustinen@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>