dropbear: deterministic selection of system -vs- bundled libtom libs
Dropbear will use system versions of libtommath and libtomcrypt if
available. To make builds deterministic, add a PACKAGECONFIG option
to choose system libs or force use of the bundled versions.
Note that currently there are no libtommath or libtomcrypt recipes
in oe-core, so default to using the bundled versions.
Signed-off-by: Andre McCurdy <armccurdy@gmail.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
