composable_kernel: revert split output workaround

pkgs/development/libraries/composable_kernel/default.nix

@@ -13,9 +13,7 @@
 , gpuTargets ? [ ] # gpuTargets = [ "gfx803" "gfx900" "gfx1030" ... ]
 }:
 
-let
-  # This is now over 3GB, to allow hydra caching we separate it
-  ck = stdenv.mkDerivation (finalAttrs: {
+stdenv.mkDerivation (finalAttrs: {
   pname = "composable_kernel";
   version = "unstable-2023-01-16";
 
@@ -85,32 +83,4 @@ let
     maintainers = teams.rocm.members;
     platforms = platforms.linux;
   };
-  });
-
-in stdenv.mkDerivation {
-  inherit (ck) pname version outputs src passthru requiredSystemFeatures meta;
-
-  dontUnpack = true;
-  dontPatch = true;
-  dontConfigure = true;
-  dontBuild = true;
-
-  installPhase = ''
-    runHook preInstall
-
-    mkdir -p $out
-    cp -an ${ck}/* $out
-  '' + lib.optionalString buildTests ''
-    cp -a ${ck.test} $test
-  '' + lib.optionalString buildExamples ''
-    cp -a ${ck.example} $example
-  '' + ''
-    runHook postInstall
-  '';
-
-  # Fix paths
-  preFixup = ''
-    substituteInPlace $out/lib/cmake/composable_kernel/*.cmake \
-      --replace "${ck}" "$out"
-  '';
-}
+})