Add sci-libs/gsl from upstream gentoo

BUG=b:124770147
TEST=emerge-hatch gsl

Change-Id: Ica478063e329cdf8a2be1afd4cdfa11106b40c0b
Reviewed-on: https://chromium-review.googlesource.com/1716997
Tested-by: Tom Hughes <tomhughes@chromium.org>
Commit-Ready: Tom Hughes <tomhughes@chromium.org>
Legacy-Commit-Queue: Commit Bot <commit-bot@chromium.org>
Reviewed-by: Mike Frysinger <vapier@chromium.org>
3 files changed