typed-ast: upgraded package to upstream

Upgraded dev-python/typed-ast to version 1.4.3 on amd64

Note: PYTHON_COMPAT was modified to reflect 3.6 compatibility.

BUG=b:192389533
TEST=emerge

Change-Id: I564858791cce978c0550e601fa3384023279b89f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2998366
Tested-by: Jack Rosenthal <jrosenth@chromium.org>
Reviewed-by: Benjamin Gordon <bmgordon@chromium.org>
Commit-Queue: Jack Rosenthal <jrosenth@chromium.org>
5 files changed