By: Tom Sydney Kerckhove <syd@cs-syd.eu>
Make the overlay one somebody else can import It carried this repository's own build flags, so anything importing it got a library built at -O0 with haddock off. The flags that are about building it here stay here; what an overlay offers a consumer is the packages. Same shape as validity and sydtest. buildFromSdist, so that what is tested is what would be published.