58e7959988
This allows multi-call binaries to be easily invoked with a different name. After installation, the name is set by creating a symlink. But in build directories, we don't create the symlinks. (There are also other ways to achieve the same thing, e.g. zsh supports $ARGV0, and exec -a can be used, but those are either non-portable or are more complicated to use.) The primary use-case for me is to test --help output for multicall binaries. Also reorder the help for env vars to group the more generic ones near the top. This was initially proposed in https://github.com/systemd/systemd/pull/24054, but there were some comments about the implementation. I had a branch with the patch, but I don't think I ever actually submitted it as a pull request.
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