Changes from 1.21.99.3 to 1.21.99.4

- ABI detection related fixes

- Lots of fixs for MacOS

- Fix host component handling in file:// URLs

- build system: add --with-tsan support

- fix threads on MacOS

- pkg -vv now shows bundled/external libraries version

- pkg: -r command can be used multiple times to only enable

  the specified repositories.

- UI: small improvements in error messages

- repositories: new pkg repositories command to list configured

  repositories

- vuxml: now fetched over https

- check: now default on the -s option when no options is passed.