Move build_* wrapper scripts to devtools

Summary:
In a discussion regarding D5270, it become clear that a inserting a dependency where automated commit jobs
rely on part of the CI code was confusing and setting a bad precedent.

While these wrapper scripts are used heavily by Teamcity (CI), their use is not limited to CI, so I've moved
them to devtools, which seems more appropriate. There is precedent for this already, as CI and automated-commits
have depenendencies on devtools,

Test Plan: Run a bunch of tests on CI to make sure everything is still working.

Reviewers: #bitcoin_abc, Fabien

Reviewed By: #bitcoin_abc, Fabien

Differential Revision: https://reviews.bitcoinabc.org/D5291