Herbert Valerio Riedel authored May 05, 2019 and Oleg Grenrus committed Nov 28, 2019

While those buildinfo fields were added to the parser some time
ago via 57d7f28e and
4a287659 that work was never completed
by implementing the necessary build/sdist logic in Cabal.

This commit remedies this oversight by implementing and wiring up the
missing build logic.

*WARNING* this commit is still very WIP; ASM works mostly; C--
          support is still incomplete