libbz2 bindings for Haskell

#1bz2 in Stackage

If bz2 is intended to replace bzlib, please send a pull request to get it into Stackage so I can port packages to it:

https://github.com/commercialhaskell/stackage/blob/master/MAINTAINERS.md

Thanks for your consideration and making a library that works with GHC 8.8.