[InterNetNews/inn] 43b0c6: Add a .git-blame-ignore-revs file

[Julien ÉLIE]

  Branch: refs/heads/main
  Home:   https://github.com/InterNetNews/inn
  Commit: 43b0c6ea3efa60889d38784bd3e99fc2328e2e83
      https://github.com/InterNetNews/inn/commit/43b0c6ea3efa60889d38784bd3e99fc2328e2e83
  Author: Julien ÉLIE <Julien-Elie at users.noreply.github.com>
  Date:   2021-11-20 (Sat, 20 Nov 2021)

  Changed paths:
    A .git-blame-ignore-revs
    M support/mkmanifest

  Log Message:
  -----------
  Add a .git-blame-ignore-revs file

This way, "git blame" won't show up cosmetic revisions.