flex: upgraded package to upstream

Upgraded sys-devel/flex to version 2.5.39-r1 for all

BUG=chromium:417051
TEST=`cbuildbot chromiumos-sdk` passes (builds sdk and 3 boards)

Change-Id: Icdb555732c1d314b3b2383ba7e68c84bec4b360b
Reviewed-on: https://chromium-review.googlesource.com/222081
Reviewed-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
5 files changed