yi: build using GHC 8.10.7

Luckily, all build failures where just related to type checking changes
in GHC 9.0 (and maybe base changes?), so we can just use GHC 8.10.7 with
the Stackage version of packages and keep Yi working. I feel like we
dodged a bullet here, as upstream maintenance doesn't seem to be too
proactive these days.

pkgs/development/haskell-modules/configuration-ghc-8.10.x.nix

@@ -111,6 +111,9 @@ self: super: {
     ghc-prim = self.hashable;
   };
 
+  # Doesn't build with 9.0, see https://github.com/yi-editor/yi/issues/1125
+  yi-core = doDistribute (markUnbroken super.yi-core);
+
   # Temporarily disabled blaze-textual for GHC >= 9.0 causing hackage2nix ignoring it
   # https://github.com/paul-rouse/mysql-simple/blob/872604f87044ff6d1a240d9819a16c2bdf4ed8f5/Database/MySQL/Internal/Blaze.hs#L4-L10
   mysql-simple = addBuildDepends [

pkgs/top-level/all-packages.nix

@@ -11579,7 +11579,9 @@ with pkgs;
   yggdrasil = callPackage ../tools/networking/yggdrasil { };
 
   # To expose more packages for Yi, override the extraPackages arg.
-  yi = callPackage ../applications/editors/yi/wrapper.nix { };
+  yi = callPackage ../applications/editors/yi/wrapper.nix {
+    haskellPackages = haskell.packages.ghc8107;
+  };
 
   yj = callPackage ../development/tools/yj { };