Try a new approach to setting Guile load paths

Don't touch the install paths, but let Guile's setup hook do the right
think[^1].  Also run `haunt --version` after installing to make sure we
got this right.

[^1]: Which it somewhat doesn't; see github:NixOS/nixpkgs#88720.

bird-lg: remove

Moved to dn42.nix along with other dn42 services.

bird-lg: Fix import in config loader script

bird-lg: Add option to log to syslog instead of stderr

bird-lg: Expand and fix default settings

bird-lg: Upstream log file patch

matrix-appservice-irc: Support reloading the config

matrix-appservice-irc: init at 0.22.0

matrix-appservice-irc: Remove secrets from registration file in store

bird-lg: Move local patches to patches/, per policy

bird-lg: Patch to fix bgpmap generation

This is github:sesa-me/bird-lg#3.

bird-lg: Copy some default settings from the config files

bird-lg: Support multiple JSON config files

bird-lg: init at 2020-05-20-unstable

lib: Add attrsets.concatMapAttrs'

Merge branch 'macos-ci' into master

dma: Limit supported platforms to Linux and the BSDs

As far as I can tell, none of the other Unix have the requisite headers
(namely `arpa/nameser.h`).

dyndnsc: Disable tests involving multiprocessing on Darwin

drep: Depend on CoreServices on macOS

ci.nix: Filter out packages incompatible with Nixpkgs system

It's the same filtering we use in flake.nix.  I'm not sure if filtering
on `meta.platforms` is needed, but that assert on the `linux` derivation
kills the whole job before it even starts.

readme: Add new build status badges

Not only add the new macOS build, but also separate our builds.sr.ht
builds.