* Up-(actually down-)grade to ghc-lib-8.8.0.20190610
* A `#ifndef GHC_STABLE` removed. `ml_hie_file` must be set unconditionally
* Pass Opt_WriteHie in xFlagsSet
* Oops. Revert. This breaks Windows. Very confusing
* Disable test; track in issue https://github.com/digital-asset/daml/issues/1582
* Remove Opt_WriteHie flag (Causes test failures trying to write into a read-only filesystem in CI)