[arch-dev-public] dropping pion

[Lukas Jirkovsky]

I would like to drop pion[1] from the [community]. The last upstream
release was approximately two years ago and there's no package in the
repository that depends on it.

If nobody objects and takes over this package, I will delete it by the
end of the week.

[1] https://www.archlinux.org/packages/community/x86_64/pion/