There is an updated pull request by slotThe against master on the void-packages repository

https://github.com/slotThe/void-packages ghc-8.10.4
https://github.com/void-linux/void-packages/pull/29506

[WIP] GHC 8.10.4
It's that time of the year again!

- [X] ghc; I took over as maintainer here, @leahneukirchen said that was okay on IRC (cc'ing here to make sure)
- [ ] ghc-bin; took over as mainainer of orphaned package.
    - [X] x86_64-musl; [Link here](https://www34.zippyshare.com/d/yvtjb7uJ/38780/ghc-8.10.4-x86_64-void-linux-musl.tar.xz)
    - [ ] i686-musl
    cc @q66 for these
    - [ ] ppc64le
    - [ ] ppc64le-musl
- [X] cabal-install
- [X] stack
 
Rebuild literally every single haskell package we have and see if anything's broken:

- [ ] git-mediate
- [ ] kmonad
- [ ] cgrep
- [ ] debug-me
- [ ] hlint
- [ ] hoogle
- [ ] darcs
- [ ] shellcheck
- [ ] git-annex
- [ ] hledger
- [ ] pandoc
- [ ] xmobar

For the following two I'd like to fix #6414 while we're at it.  Because stack can't install libraries globally, this would involve either removing these packages entirely and advising users to install them in their own [stack or cabal projects](https://github.com/xmonad/xmonad-testing), or finding a way to build them with cabal and updating ghc's data base accordingly.  This would probably use `v1` commands, as we don't want to nuke our users db if we update xmonad. Cc @xaltsc as the current maintainer and @chilledfrogs as someone who might want to tackle this (if I read the IRC discussion correctly). 

- [ ] xmonad
- [ ] xmonad-contrib

<!-- Mark items with [x] where applicable -->

#### General
- [ ] This is a new package and it conforms to the [quality requirements](https://github.com/void-linux/void-packages/blob/master/Manual.md#quality-requirements)

#### Have the results of the proposed changes been tested?
- [X] I use the packages affected by the proposed changes on a regular basis and confirm this PR works for me
- [ ] I generally don't use the affected packages but briefly tested this PR

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#### Does it build and run successfully? 
(Please choose at least one native build and, if supported, at least one cross build. More are better.)
- [X] I built this PR locally for my native architecture, (ARCH-LIBC)
- [ ] I built this PR locally for these architectures (if supported. mark crossbuilds):
  - [ ] aarch64-musl
  - [ ] armv7l
  - [ ] armv6l-musl

[ci skip]


A patch file from https://github.com/void-linux/void-packages/pull/29506.patch is attached