As announced on the mailing list[2] pacman has been migrated to gitlab
and there is no real use for patchwork left, so it can be
decommissioned. A static copy[1] is kept around for the time being to
avoid link rot.

[1] https://gitlab.archlinux.org/archlinux/patchwork-archive
[2] https://lists.archlinux.org/archives/list/arch-dev-public@lists.archlinux.org/message/7B6R5HVEC67U7B2VQ3SKUVXU4RDCRRMM/

Fix #487