After enable tk via PACKAGECONFIG for python3,
there comes below error:
Missing or unbuildable dependency chain was: ['buildtools-tarball', 'nativesdk-python3-testtools', 'nativesdk-python3-pbr', 'nativesdk-python3', 'nativesdk-tk', 'nativesdk-libxt', 'nativesdk-libsm']
Extend libsm to nativesdk to fix this issue.
Signed-off-by: Mingli Yu <Mingli.Yu@windriver.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
