Forcing gcc ABI and safer bash scripts, v2 (#20540)
Summary:
First time this was merged it broke master and was reverted. This time I do not add ```set -u``` to the .circleci/scripts/setup* scripts. There's still a chance that ```set -u``` breaks the binary builds on master, but at least those can be fixed in parallel and don't completely eliminate signal from all merges.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/20540
Differential Revision: D15373444
Pulled By: pjh5
fbshipit-source-id: 0203c20865827366ecd8fa07b2db74d255549ed1
