tar: upgraded package to upstream

Upgraded app-arch/tar to version 1.34-r2 on amd64

Also manually add app-alternatives/tar as it is now PDEPEND'ed by
app-arch/tar

BUG=b:268870079
TEST=CQ

Change-Id: I0b116b35139f178d2aa48f9287a5f351758be7ed
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/4297495
Reviewed-by: François Degros <fdegros@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
Commit-Queue: Nigel Tao <nigeltao@chromium.org>
Tested-by: Nigel Tao <nigeltao@chromium.org>
6 files changed