archivers/advancecomp: Update to 2.1-6 and take maintainership

• Switch to new upstream
• Unbundle libdeflate
• Hookup test suite
• Add a BZIP2 option

PR: 259534
MFH: 2021Q4 (security fix)
Security: 0bf816f6-3cfe-11ec-86cd-dca632b19f10
(cherry picked from commit 684b29d2c7710765c50bd3541723ea4f58b1d474)