Build cpuinfo as ExternalProject

[swolchok]

Yet another (and hopefully the last) needed ExternalProject to get EXPORT working.

[swolchok]

Stack from ghstack (oldest at bottom):

• Use CMake EXPORT #8954
• Don't use iOS toolchain on macOS #12578
• 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/12513

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

❌ 6 New Failures, 2 Cancelled Jobs, 4 Unrelated Failures

As of commit 225d5a6 with merge base 986be2a ():

NEW FAILURES - The following jobs have failed:

• Build Linux Wheels / pytorch/executorch / build-manywheel-py3_10-cpu (gh)
  undefined reference to pthread_once'`
• Build Linux Wheels / pytorch/executorch / build-manywheel-py3_11-cpu (gh)
  undefined reference to pthread_once'`
• Build Linux Wheels / pytorch/executorch / build-manywheel-py3_12-cpu (gh)
  undefined reference to pthread_once'`
• Build Linux Wheels / pytorch/executorch / upload / upload-manywheel-py3_10-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.10_cpu_x86_64
• Build Linux Wheels / pytorch/executorch / upload / upload-manywheel-py3_12-cpu (gh)
  Unable to download artifact(s): Artifact not found for name: pytorch_executorch__3.12_cpu_x86_64
• pull / test-eval_llama-mmlu-linux / linux-job (gh)
  RuntimeError: Command docker exec -t 294f51e7f00a65064fdbb9d34663e7e55ce908fe7c2da893aa44bbbc4784dadb /exec failed with exit code 1

CANCELLED JOBS - The following jobs were cancelled. Please retry:

• trunk / test-llama-runner-mac (fp32, xnnpack+custom+quantize_kv) / macos-job (gh)
• trunk / test-models-macos (mv3, portable) / macos-job (gh)
  ##[error]The operation was canceled.

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• Build Linux Wheels / pytorch/executorch / upload / upload-manywheel-py3_11-cpu (gh) (detected as infra flaky with no log or failing log classifier)

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

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

• pull / unittest / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_ring_attention.py::TestRingAttention::test_sliding_window_attention
• pull / unittest-editable / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_ring_attention.py::TestRingAttention::test_sliding_window_attention
• trunk / unittest-release / linux / linux-job (gh) (trunk failure)
  examples/models/llama/tests/test_ring_attention.py::TestRingAttention::test_sliding_window_attention

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[swolchok]

unittest linux failures look like flakes, should be good to go, adding ciflow/trunk to make sure