Nettle is primarily a library that ships some tools, so inherit the
lib_package class to package the tools in nettle-bin, and add a
dependency on it to nettle-ptest.
(From OE-Core rev: eacfc88e0efe534290205ca8e399629623d882aa)
Signed-off-by: Ross Burton <ross.burton@arm.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>