gmp: upgraded package to upstream

Upgraded dev-libs/gmp to version 6.2.1-r2 on amd64, arm and arm64

BUG=chromium:1271896
TEST=FEATURES="test" emerge dev-libs/gmp

Change-Id: I33991d1b7271a2411b5b4d8be7d02e4e50665052
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/3351990
Reviewed-by: Allen Webb <allenwebb@google.com>
Tested-by: Zi Lin <lziest@chromium.org>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
Commit-Queue: Zi Lin <lziest@chromium.org>
4 files changed