dev-python/typing: Import from gentoo

dev-pyhon/typing is required to build dev-python/m2crypto-0.26.0, which
itself is required to build against OpenSSL 1.1.

Pull latest from upstream gentoo with small changes:
 * KEYWORDS=*
 * EAPI=5
 * Remove 3_6 from PYTHON_COMPAT

Signed-off-by: Daniel Kurtz <djkurtz@chromium.org>

BUG=chromium:734499
TEST=sudo emerge typing
 => Builds ok

Change-Id: If0da3c1d81379c1cb6288e274d8fce5a13609e3a
Reviewed-on: https://chromium-review.googlesource.com/544492
Commit-Ready: Daniel Kurtz <djkurtz@chromium.org>
Tested-by: Daniel Kurtz <djkurtz@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
3 files changed