- extend/os/linux/development_tools: handle no /usr/bin/gcc
- Separate test from runtime dependencies in Formula#to_hash
- Checks GitHub API if homepage 404s during brew audit --online
- Include test deps when loading a formula from the API
- linux/keg_relocate: clean up GCC RPATH fix.
- extend/ENV/std: ignore fails_with during brew test.
- formula_auditor: fix false negatives in audit_gcc_dependency
