re2: upgraded package to 2016.05.01

Upgraded dev-libs/re2 to version 2016.05.01 on amd64, arm, and x86.
Manually copied.

BUG=None
TEST=ran build_packages for link, daisy, and x86-generic boards.

Change-Id: I2db3cc2d7394199ecf9f872783c0d1d70b8d6512
Reviewed-on: https://chromium-review.googlesource.com/423433
Commit-Ready: Jennifer Pullman <jpullman@chromium.org>
Tested-by: Jennifer Pullman <jpullman@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
5 files changed