haskell.packages.ghc865Binary.exceptions: restore package, use 0.10.7…

… version

In NixOS#278074 I removed `exception`
completely. But `nixpkgs` has a version of `exceptions we could use.
Let's enable that instead.

pkgs/development/haskell-modules/configuration-ghc-8.6.x.nix

@@ -95,7 +95,7 @@ self: super: {
   ghc-lib-parser-ex = addBuildDepend self.ghc-lib-parser super.ghc-lib-parser-ex;
 
   # This became a core library in ghc 8.10., so we don’t have an "exception" attribute anymore.
-  exceptions = null;
+  exceptions = super.exceptions_0_10_7;
 
   # Older compilers need the latest ghc-lib to build this package.
   hls-hlint-plugin = addBuildDepend self.ghc-lib super.hls-hlint-plugin;