Build FXDiv as ExternalProject

[swolchok]

No description provided.

[swolchok]

Stack from ghstack (oldest at bottom):

• Use CMake EXPORT #8954
• append to CMAKE_PREFIX_PATH instead of setting executorch_DIR #12618
• Turn BUILD_TESTING off if EXECUTORCH_BUILD_TESTS is off #12566
• Remove bundled_program dep from mpsdelegate #12562
• -> Build FXDiv as ExternalProject #12561
• format even more CMakeLists.txt files #12560
• Build cpuinfo as ExternalProject #12513
• Convert pthreadpool to ExternalProject #12468
• Build XNNPACK as an ExternalProject #12425

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/12561

• 📄 Preview Python docs built from this PR

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❌ 1 New Failure, 4 Unrelated Failures

As of commit 00acd77 with merge base b9bb3c1 ():

NEW FAILURE - The following job has failed:

• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 60a87cdd8ab78c2dd18c96bf85e0d36f55e9f0bb8e9fc5a36cedfb5829030fcf /exec failed with exit code 1

BROKEN TRUNK - The following jobs failed but were present on the merge base:

👉 Rebase onto the `viable/strict` branch to avoid these failures

• pull / unittest / linux / linux-job (gh) (trunk failure)
  backends/apple/coreml/test/test_coreml_partitioner.py::TestCoreMLPartitioner::test_ops_to_not_decompose
• pull / unittest / macos / macos-job (gh) (trunk failure)
  backends/apple/coreml/test/test_coreml_partitioner.py::TestCoreMLPartitioner::test_ops_to_not_decompose
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  backends/apple/coreml/test/test_coreml_partitioner.py::TestCoreMLPartitioner::test_ops_to_not_decompose
• pull / unittest-editable / macos / macos-job (gh) (trunk failure)
  backends/apple/coreml/test/test_coreml_partitioner.py::TestCoreMLPartitioner::test_ops_to_not_decompose

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