Drop mingwW64 from ci

Author: hamishmack

ci.nix

@@ -89,11 +89,6 @@
        || (system == "aarch64-darwin" && !builtins.elem compiler-nix-name ["ghc902" "ghc928" "ghc948" "ghc966" "ghc982" "ghc983" "ghc984"])
        )) {
     inherit (lib.systems.examples) ghcjs;
-  } // lib.optionalAttrs (
-         (__match ".*llvm" compiler-nix-name == null)
-      && ((system == "x86_64-linux"  && !builtins.elem compiler-nix-name ["ghc902" "ghc928"]) # Including GHC HEAD here because the patches for rts/RtsSymbols.c no longer apply and mingwW64 GHC build fails without them
-       || (system == "x86_64-darwin" && builtins.elem compiler-nix-name []))) { # TODO add ghc versions when we have more darwin build capacity
-    inherit (lib.systems.examples) mingwW64;
   } // lib.optionalAttrs (nixpkgsName == "unstable"
       && (__match ".*llvm" compiler-nix-name == null)
       && ((system == "x86_64-linux"  && !builtins.elem compiler-nix-name ["ghc8107" "ghc902" "ghc928" "ghc948"])