Double-dash no longer needed on Linux
In this release, we work around a quirk of the GNU parameter parser which required us to use double-dashes (--) after doas's parameters and before a target command's parameters. In the past we used "doas -- pacman -Syu" and now we can use simply "doas pacman -Syu".
This change affects only GNU/Linux systems, other platforms like FreeBSD, NetBSD, etc already had this behaviour.