Environment is set in too many places

[pwaller]

At the moment the environment is set in too many places:

• During build of host AMI.
• In compiler docker image.
• In job definition.
• In job runtime overrides (platform).
• reco-aws.sh
• sdaccel-builder.mk
• settings.sh in the root of reco-sdaccel

This makes it very hard to quickly make a reproducible developer environment, and diagnose runtime issues. It adds a lot of cognitive overhead during development and firefighting.

I suggest we find one place to configure the environment, try to minimize it, and remove all other tweaks to the environment.