pony-stable: removal

pony-stable was deprecated upstream on May 12 2020
and we replaced by pony-corral.

pkgs/development/compilers/ponyc/pony-stable.nix

@@ -1,25 +0,0 @@
-{lib, stdenv, fetchFromGitHub, ponyc }:
-
-stdenv.mkDerivation rec {
-  pname = "pony-stable";
-  version = "0.2.2";
-
-  src = fetchFromGitHub {
-    owner = "ponylang";
-    repo = "pony-stable";
-    rev = version;
-    sha256 = "0nzvsqvl315brp3yb4j5kl82xnkmib4jk416jjc7yrz4k3jgr278";
-  };
-
-  buildInputs = [ ponyc ];
-
-  installFlags = [ "prefix=${placeholder "out"}" "install" ];
-
-  meta = {
-    description = "A simple dependency manager for the Pony language";
-    homepage = "https://www.ponylang.org";
-    license = lib.licenses.bsd2;
-    maintainers = with lib.maintainers; [ dipinhora kamilchm patternspandemic ];
-    platforms = lib.platforms.unix;
-  };
-}

pkgs/top-level/all-packages.nix

@@ -12348,7 +12348,6 @@ with pkgs;
   };
 
   pony-corral = callPackage ../development/compilers/ponyc/pony-corral.nix { };
-  pony-stable = callPackage ../development/compilers/ponyc/pony-stable.nix { };
 
   qbe = callPackage ../development/compilers/qbe { };