darwin.libdispatch: remove and replace with stubs

pkgs/os-specific/darwin/apple-source-releases/default.nix

@@ -262,7 +262,6 @@ developerToolsPackages_11_3_1 // macosPackages_11_0_1 // {
     AvailabilityVersions = callPackage ./AvailabilityVersions/package.nix { };
     copyfile        = callPackage ./copyfile/package.nix { };
     Csu             = callPackage ./Csu/package.nix { };
-    libdispatch     = applePackage "libdispatch"       "osx-10.12.4"     "sha256-xUqoG5JK4P3nXeoVUOBzodVK9fjH/I3xJ6WRtM39bdw=" {};
     libmalloc       = if isSdk10_12 then
       applePackage "libmalloc" "osx-10.12.6" "sha256-brfG4GEF2yZipKdhlPq6DhT2z5hKYSb2MAmffaikdO4=" {}
     else macosPackages_11_0_1.libmalloc;

pkgs/os-specific/darwin/apple-source-releases/libdispatch/default.nix

@@ -1,58 +0,0 @@
-{ lib, appleDerivation', stdenvNoCC }:
-
-appleDerivation' stdenvNoCC (finalAttrs: {
-  dontConfigure = true;
-  dontBuild = true;
-  installPhase = ''
-    mkdir -p $out/include/dispatch $out/include/os
-
-    # Move these headers so CF can find <os/voucher_private.h>
-    cp -r private/*.h  $out/include/dispatch
-
-    cp -r dispatch/*.h $out/include/dispatch
-    cp -r os/object*.h  $out/include/os
-
-    # gcc compatibility. Source: https://stackoverflow.com/a/28014302/3714556
-    substituteInPlace $out/include/dispatch/object.h \
-      --replace-fail 'typedef void (^dispatch_block_t)(void);' \
-                '#ifdef __clang__
-                 typedef void (^dispatch_block_t)(void);
-                 #else
-                 typedef void* dispatch_block_t;
-                 #endif'
-  '';
-
-  appleHeaders = ''
-    dispatch/base.h
-    dispatch/benchmark.h
-    dispatch/block.h
-    dispatch/data.h
-    dispatch/data_private.h
-    dispatch/dispatch.h
-    dispatch/group.h
-    dispatch/introspection.h
-    dispatch/introspection_private.h
-    dispatch/io.h
-    dispatch/io_private.h
-    dispatch/layout_private.h
-    dispatch/mach_private.h
-    dispatch/object.h
-    dispatch/once.h
-    dispatch/private.h
-    dispatch/queue.h
-    dispatch/queue_private.h
-    dispatch/semaphore.h
-    dispatch/source.h
-    dispatch/source_private.h
-    dispatch/time.h
-  ''
-  + lib.optionalString (lib.versionAtLeast "1271.40.12" finalAttrs.version) ''
-    dispatch/time_private.h
-    dispatch/workloop.h
-    dispatch/workloop_private.h
-  ''
-  + ''
-    os/object.h
-    os/object_private.h
-  '';
-})

pkgs/os-specific/darwin/apple-source-releases/macos-11.0.1.nix

@@ -12,7 +12,6 @@ bootstrap_cmds = callPackage ./bootstrap_cmds/package.nix { };
 copyfile = applePackage' "copyfile" "173.40.2" "macos-11.0.1" "1j20909inn2iw8n51b8vk551wznfi3bhfziy8nbv08qj5lk50m04" {};
 diskdev_cmds = applePackage' "diskdev_cmds" "667.40.1" "macos-11.0.1" "0wr60vyvgkbc4wyldnsqas0xss2k1fgmbdk3vnhj6v6jqa98l1ny" {};
 file_cmds = applePackage' "file_cmds" "321.40.3" "macos-11.0.1" "0p077lnbcy8266m03a0fssj4214bjxh88y3qkspnzcvi0g84k43q" {};
-libdispatch = applePackage' "libdispatch" "1271.40.12" "macos-11.0.1" "1ck5srcjapg18vqb8wl08gacs7ndc6xr067qjn3ngx39q1jdcywz" {};
 libmalloc = applePackage' "libmalloc" "317.40.8" "macos-11.0.1" "sha256-Tdhb0mq3w4Hwvp3xHB79Vr22hCOQK6h28HCsd7jvITI=" {};
 libplatform = applePackage' "libplatform" "254.40.4" "macos-11.0.1" "1qf3ri0yd8b1xjln1j1gyx7ks6k3a2jhd63blyvfby75y9s7flky" {};
 libpthread = applePackage' "libpthread" "454.40.3" "macos-11.0.1" "0zljbw8mpb80n1if65hhi9lkgwbgjr8vc9wvf7q1nl3mzyl35f8p" {};

pkgs/top-level/darwin-packages.nix

@@ -92,6 +92,7 @@ makeScopeWithSplicing' {
     "hfsHeaders"
     "launchd"
     "libclosure"
+    "libdispatch"
   ] (mkStub apple_sdk.version);
 in
 impure-cmds // appleSourcePackages // stubs // {