Commits on Feb 2, 2024

1. toolchains/cc: Fix process getting killed on aarch64-darwin during li… …

   …nking
   
   On aarch64 Darwin, when using a nixpkgs provided cc toolchain, we have [seen][1]
   the linking step to fail as the process got killed:
   
   ```
   bazel-out/darwin_arm64-opt-exec-2B5CBBC6/bin/external/rules_haskell/haskell/ghc_wrapper: line 80: 90734 Killed: 9
                  "${compile_flags[@]}" "${extra_args[@]}" 2>&1
        90736 Done                    | drop_loaded_and_warning 1>&2
   ```
   
   More specifically this happened when trying to add an rpath to a dylib calling the `install_name_tool`, but
   running the same command manually succeeded.
   
   This seems to be caused by mixing different tools from stdenv.cc and darwin.cctools, especially the fact that
   the tools from the latter overwrote tools from the former.
   
   Only add missing tools not provided by the current cc toolchain from the darwin.cctools package instead.
   
   [1]: tweag/rules_haskell#2101

   

   avdv committed Feb 2, 2024
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