mac: Stop downloading lld_mac package

lld is part of the main clang package as of
https://chromium-review.googlesource.com/c/chromium/src/+/2977792

Also, this hook has been a no-op since
https://chromium-review.googlesource.com/c/chromium/src/+/2976635

Bug: chromium:1149587
Change-Id: I5663d54dffc65da9bf413bede5ad25412dc33dbe
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/3022041Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Auto-Submit: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#75687}

DEPS

@@ -566,17 +566,6 @@ hooks = [
       '--boot-images={checkout_fuchsia_boot_images}',
     ],
   },
-  {
-    # Mac doesn't use lld so it's not included in the default clang bundle
-    # there. However, lld is need in Fuchsia cross builds, so
-    # download it there.
-    # Should run after the clang hook.
-    'name': 'lld/mac',
-    'pattern': '.',
-    'condition': 'host_os == "mac" and checkout_fuchsia',
-    'action': ['python', 'tools/clang/scripts/update.py',
-               '--package=lld_mac'],
-  },
   {
       # Mac does not have llvm-objdump, download it for cross builds in Fuchsia.
     'name': 'llvm-objdump',