treewide: drop LLVM8

[ghost]

Description of changes

drop llvmPackages_8. There are only two references in nixpkgs that need to be removed.

• qv2ray uses clang_8 for darwin, darwin build marked as broken, just remove clang_8
• windows.crossThreadsStdenv references llvmPackages_8 which was added in change 06c5e81. replaced with the llvmPackages alias not clear what is correct or how to test.

nixpkgs-review x64 linux

27 packages removed: clang (†8.0.1) clang (†8.0.1) clang-manpages (†8.0.1) clang-tools (†8.0.1) clang-wrapper (†8.0.1) clang-wrapper (†8.0.1) clang-wrapper (†8.0.1) clang-wrapper (†8.0.1) clang-wrapper (†8.0.1) clang-wrapper (†8.0.1) clang-wrapper (†8.0.1) compiler-rt-libc (†8.0.1) compiler-rt-libc (†8.0.1) libcxx (†8.0.1) libcxxabi (†8.0.1) libunwind (†8.0.1) lld (†8.0.1) lldb (†8.0.1) llvm (†8.0.1) llvm (†8.0.1) llvm (†8.0.1) llvm-binutils (†8.0.1) llvm-binutils-wrapper (†8.0.1) llvm-binutils-wrapper (†8.0.1) openmp (†8.0.1) stdenv-linux (†) stdenv-linux (†)

Nothing to be built.

Result of nixpkgs-review run on x86_64-linux 1

nixpkgs-review x64 darwin

27 packages removed: clang (†8.0.1) clang (†8.0.1) clang-manpages (†8.0.1) clang-tools (†8.0.1) clang-wrapper (†8.0.1) clang-wrapper (†8.0.1) clang-wrapper (†8.0.1) clang-wrapper (†8.0.1) clang-wrapper (†8.0.1) clang-wrapper (†8.0.1) clang-wrapper (†8.0.1) compiler-rt-libc (†8.0.1) compiler-rt-libc (†8.0.1) libcxx (†8.0.1) libcxxabi (†8.0.1) libunwind (†8.0.1) lld (†8.0.1) lldb (†8.0.1) llvm (†8.0.1) llvm (†8.0.1) llvm (†8.0.1) llvm-binutils (†8.0.1) llvm-binutils-wrapper (†8.0.1) llvm-binutils-wrapper (†8.0.1) openmp (†8.0.1) stdenv-darwin (†) stdenv-darwin (†)

Result of `nixpkgs-review` run on x86_64-darwin [1](https://github.com/Mic92/nixpkgs-review)

1 package marked as broken and skipped: qv2ray

Things done

• Built on platform(s)
  • x86_64-linux
  • aarch64-linux
  • x86_64-darwin
  • aarch64-darwin
• For non-Linux: Is sandboxing enabled in nix.conf? (See Nix manual)
  • sandbox = relaxed
  • sandbox = true
• Tested, as applicable:
  • NixOS test(s) (look inside nixos/tests)
  • and/or package tests
  • or, for functions and "core" functionality, tests in lib/tests or pkgs/test
  • made sure NixOS tests are linked to the relevant packages
• Tested compilation of all packages that depend on this change using nix-shell -p nixpkgs-review --run "nixpkgs-review rev HEAD". Note: all changes have to be committed, also see nixpkgs-review usage
• Tested basic functionality of all binary files (usually in ./result/bin/)
• 24.05 Release Notes (or backporting 23.05 and 23.11 Release notes)
  • (Package updates) Added a release notes entry if the change is major or breaking
  • (Module updates) Added a release notes entry if the change is significant
  • (Module addition) Added a release notes entry if adding a new NixOS module
• Fits CONTRIBUTING.md.

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[ghost]

nixpkgs-review pr 283551 rather than nixpkgs-review rev HEAD rebuilds tests.cc-wrapper.supported on x64 linux.

Result of nixpkgs-review pr 283551 run on x86_64-linux 1

1 package built:

• tests.cc-wrapper.supported