Upgrade autotools-utils eclass to upstream.

This drops support for EAPI 2 and 3 because they used path_exists which
is banned in EAPI 7 upstream.

BUG=chromium:1117585
TEST=CQ passes

Change-Id: I00da47b510af3a7b917ccdc323fd8928783a5c26
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2372695
Tested-by: Allen Webb <allenwebb@google.com>
Commit-Queue: Allen Webb <allenwebb@google.com>
Reviewed-by: Manoj Gupta <manojgupta@chromium.org>
1 file changed