ghcjs-dom-hello with hix fails to build webkit, splitmix

[cliffordbeshers]

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I am no longer able to get a nix flake with ghcjs-dom as a dependency. The webkit packages fail to build, and when removed, splitmix (a dependency of QuickCheck) fails to build with javascript-unknown-ghcjs, possibly because of an llvm bug.

To make this easy to reproduce, I forked github:ghcjs/ghcjs-dom-hello to github:cliffordbeshers/ghcjs-dom-hello and committed files for each stage. For all the build failures, the output of nix log is stored in LOG.

Any guidance to getting a working flake with ghcjs-dom included would be appreciated. I can live without jsaddle/webkit for now.