libxml2, libxslt: upgraded packages to upstream

Upgraded dev-libs/libxml2 to version 2.9.10 on amd64
Upgraded dev-libs/libxslt to version 1.1.34 on amd64

BUG=chromium:1039058
TEST=CQ-passes

Change-Id: I1517bf7f9ce796523460453af16b8ef32fe0d9bc
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/overlays/portage-stable/+/2329148
Tested-by: Allen Webb <allenwebb@google.com>
Commit-Queue: Allen Webb <allenwebb@google.com>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
15 files changed