While the last wlc upgrade (05d79c03ec)
makes it possible to build sway 0.14.0 it also breaks the current build
of sway 0.13.0.
Unfortunately sway 0.14.0 segfaults on launch and I couldn't fix it yet
(there are multiple upstream issues as well). I'll overwrite the wlc
version for sway in order to have a usable version in nixpkgs for the
meantime.