Continuation of i686 support

As part of our community's heightened interest https://lists.parabola.nu/pipermail/dev/2017-May/005549.html in platforms amenable to user freedom, Parabola will continue supporting the i686 port for the foreseeable future. The base distro will be based on packages from Arch's unofficial 32-bit port, starting today.

Users don't need to do anything to make the transition. Just make sure you are using the latest libre/archlinux32-keyring (required by default since pacman 5.0.2-2.parabola1.1) and upgrade as usual.

During the next few days upgrade operations will greet you with warning messages about available downgrades. These are due to the 32-bit port catching up to the state where official Arch left, and can be safely ignored.