Instead of relying completely on the python packaging manifest,
allow some default values. This is useful for the edge cases that
can't be found automatically by the create_manifest step.
In particular, tkinter can't be built for python3-native, so its
consistently missed in manifest updates.
Signed-off-by: Dan McGregor <dan.mcgregor@usask.ca> Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>