git: upgraded package to upstream

Upgraded dev-vcs/git to version 2.16.4 on amd64, arm, x86.

Changed EAPI from 6 to 5.

BUG=b:80453865, chromium:840379, chromium:1106153
TEST=Manually verified git works on lakitu.

Change-Id: I4729789f1e860f84f745ff2548e46a72fc551c2f
Reviewed-on: https://chromium-review.googlesource.com/1080279
Commit-Ready: Xuewei Zhang <xueweiz@google.com>
Tested-by: Xuewei Zhang <xueweiz@google.com>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
(cherry picked from commit 5c1355965799a11256d05aeda4dd4c646c4e040b)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2342007
Tested-by: Mike Frysinger <vapier@chromium.org>
(cherry picked from commit ad00d4ccb951fda28d40ec7661919036905bad5a)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2348923
7 files changed