buildtools-tarball: package all of Python

Instead of cherry-picking pieces of Python to put into the buildtools tarball,
ship all of it.  We can't predict what bits of Python will be needed in the
future.

(From OE-Core rev: 1cf1edcd28a002291622d04dd2d0ee2c67e329e4)

Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Merge branch 'dizzy' of git://git.yoctoproject.org/poky into dizzy