Summary
- Update links to 2.18 (commit: a959a58) (details)
- zstd: Ship zstdgrep & zstdless, require GNU grep (commit: 17b617c) (details)
- Update Percona Server 5.6 to 5.6.42-84.2 (commit: 1e6f2ec) (details)
- Update Percona Server 5.7 to 5.7.24-27 (commit: 397944e) (details)
- Update rust to 1.31.1 (commit: 36e5316) (details)