Fix lib tests

js-ghcjs didn't fit in an existing categor.

pkgs/stdenv/cross/default.nix

@@ -62,7 +62,7 @@ in lib.init bootStages ++ [
              # `null` or skipping the attribute would cause an eval failure
              # `tryEval` wouldn't catch, wrecking accessing previous stages
              # when there is a C compiler and everything should be fine.
-             then throw "no C compile provided for this platform"
+             then throw "no C compiler provided for this platform"
            else if crossSystem.useLLVM or false
              then buildPackages.llvmPackages_8.lldClang
            else buildPackages.gcc;