On Linux and FreeBSD, this means we no longer need to install Go twice,
since we don't need to bootstrap a Go build. This reduces the "install
go" step by over half a minute, and avoids installing a number of distro
packages.
Debian requires the pkg-config package to be explicit, as it's not part
of the build-essential metapackage, and we need it. It was being pulled
as a dependency from the golang package before.
OpenBSD is nearly the same change, modulo the fact that Go doesn't have
a binary release for it. So instead, we keep installing Go via the
system's package, and we download and build a source archive.
Finally, switch from Debian testing+experimental to simply unstable.
Sway 1.4 finally hit unstable a few days ago, and experimental is
extremely unstable, so this is a step in the right direction. Add a TODO
about going to just testing once sway 1.4 arrives there.
Signed-off-by: Daniel Martí <mvdan@mvdan.cc>
Elias Naur