uninative: Add version to uninative tarball name

uninative works via hashes and doesn't need the version in the tarball name but
it does make things easier to inspect in DL_DIR. There were reasons such as
ease of publication of the build tarballs but we can handle those differently
now and the signature issues from the early code aren't an issue now. From 3.4
onwards we can use a version'd name.

[YOCTO #12970]

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>