buildman: Add support for building a buildman PyPi package

Create the necessary files to build this new package.

It is not actually clear whether this is useful, since buildman has no
purpose outside U-Boot. It is included for completeness, since adding
this later would be more trouble.

Move the main program into a function so that it can easily be called by
the PyPi-created script.

Signed-off-by: Simon Glass <sjg@chromium.org>
2 files changed