LAKITU: Add packages required for PEP517 support

Import PEP517-related packages from the Gentoo upstream.

- Add custom patch that converts dev-python/tomli from
  using flit_core to using distutils to break the circular
  dependency.

BUG=b/257113269
TEST=presubmit
RELEASE_NOTE=None

Change-Id: Ie5f29c0621af0a6c71ebe39576ab7c3620f0d40e
Reviewed-on: https://cos-review.googlesource.com/c/third_party/overlays/portage-stable/+/42248
Reviewed-by: Vaibhav Rustagi <vaibhavrustagi@google.com>
Tested-by: Cusky Presubmit Bot <presubmit@cos-infra-prod.iam.gserviceaccount.com>
13 files changed