Revision 470870

Update lang/ghc 8.4.2 and the hs-* ports the newer versions

* Update lang/ghc to 8.4.2
* Update the boostrap compiler to 8.4.1
* Update the many hs-* ports
* Bump the rest

Thanks a lot to arrowd for doing all the heavy lifting :)

PR:		227968
Exp-run by:	antoine
Submitted by:	arrowd
Differential Revision:	https://reviews.freebsd.org/D15005