moby: remove, merged into linuxkit in 2018

Don't alias linuxkit, as linuxkit is not a drop-in replacement.
Instead, throw with an explanation.
(thanks reviewers!)

pkgs/development/tools/misc/moby/default.nix

@@ -1,27 +0,0 @@
-{ lib, buildGoPackage, fetchFromGitHub }:
-
-buildGoPackage rec {
-  pname = "moby";
-  version = "2017-07-06";
-  rev = "d87a3f9990ed24ebbb51695879cd640cb07a4b40";
-
-  goPackagePath = "github.com/moby/tool";
-
-  src = fetchFromGitHub {
-    owner = "moby";
-    repo = "tool";
-    inherit rev;
-    sha256 = "0xhasm69g5gwihcm8g7rff9nkx7iffvd642bknky6j3w133gs5lp";
-  };
-
-  preBuild = ''
-    buildFlagsArray+=("-ldflags" "-X main.GitCommit=${builtins.substring 0 7 rev} -X main.Version=0.0.0")
-  '';
-
-  meta = {
-    description = "Assembly tool for the Moby project, an open framework to assemble specialized container systems without reinventing the wheel";
-    license = lib.licenses.asl20;
-    homepage = https://mobyproject.org;
-    platforms = lib.platforms.unix;
-  };
-}

pkgs/top-level/aliases.nix

@@ -252,6 +252,7 @@ mapAliases ({
   midoriWrapper = midori; # added 2015-01
   mlt-qt5 = libsForQt5.mlt;  # added 2015-12-19
   mobile_broadband_provider_info = mobile-broadband-provider-info; # added 2018-02-25
+  moby = throw "moby has been removed, merged into linuxkit in 2018.  Use linuxkit instead.";
   module_init_tools = kmod; # added 2016-04-22
   mono-zeroconf = throw "deprecated 2019-09-20: abandoned by upstream.";
   mozart = mozart2-binary; # added 2019-09-23

pkgs/top-level/all-packages.nix

@@ -10339,8 +10339,6 @@ in
 
   mkdocs = callPackage ../development/tools/documentation/mkdocs { };
 
-  moby = callPackage ../development/tools/misc/moby { };
-
   modd = callPackage ../development/tools/modd { };
 
   msgpack-tools = callPackage ../development/tools/msgpack-tools { };