git: upgraded packages to upstream

Upgraded dev-vcs/git to version 2.18.1 on amd64, arm

BUG=chromium:840379, chromium:1106153
TEST=update_chroot; build test image for coral, verify that it boots;
    rebuild chromeos-sdk

Change-Id: I2669ce2c08055a87de1ae2c1b13f7cb5d17e01b7
Reviewed-on: https://chromium-review.googlesource.com/1311333
Commit-Ready: ChromeOS CL Exonerator Bot <chromiumos-cl-exonerator@appspot.gserviceaccount.com>
Tested-by: LaMont Jones <lamontjones@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
(cherry picked from commit 3ad2b7b7bf264b9cf654d6d7be850c6075207db0)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2341990
Tested-by: Mike Frysinger <vapier@chromium.org>
(cherry picked from commit c11104fe12ae74ff15916a2fcf6050e099bff1e8)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2340769
(cherry picked from commit 5a061c26ab3620adba62969cb002f24a4c9fb231)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2342659
(cherry picked from commit 8a85a3f23358ede1a68b37f38c9d89a40c77ea0b)
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2348924
3 files changed