Add rpath to libcustom_ops_aot_lib.dylib and libquantized_ops_aot_lib…

[larryliu0820]

….dylib

Summary: As titled. This issue is from https://github.com/pytorch/torchchat/actions/runs/11523122333/job/32080481174?pr=1312

In that job when we try to load libcustom_ops_aot_lib.dylib into python, it complains that it can't find _portable_lib.cpython-310-darwin.so. This PR is trying to fix it by adding the relative path to _portable_lib.cpython-310-darwin.so into LC_RPATH.

Test Plan:

EXECUTORCH_BUILD_PYBIND=ON python setup.py bdist_wheel
rm -rf pip-out/
pip install dist/executorch-0.5.0a0+8222c24-cp310-cp310-macosx_11_0_arm64.whl
python -c "from executorch.extension.llm.custom_ops import sdpa_with_kv_cache"

Also see otool -l /executorch/extension/llm/custom_ops/libcustom_ops_aot_lib.dylib gives:

Load command 17
          cmd LC_RPATH
      cmdsize 48
         path @loader_path/../../pybindings (offset 12)

Reviewers:

Subscribers:

Tasks:

Tags:

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/6499

• 📄 Preview Python docs built from this PR

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❌ 1 New Failure, 2 Unrelated Failures

As of commit 9113c47 with merge base 5889cc3 ():

NEW FAILURE - The following job has failed:

• pull / test-llama-runner-linux (bf16, buck2, custom) / linux-job (gh)
  RuntimeError: Command docker exec -t 259724a04c14081915853fea32dbcbc5e06a0e0f10df71276290324953dca49c /exec failed with exit code 1

UNSTABLE - The following jobs failed but were likely due to flakiness present on trunk and has been marked as unstable:

• Build Linux Wheels / pytorch/executorch / upload / manywheel-py3_9-cpu (gh) (#4308)
  ##[error]Unable to find any artifacts for the associated workflow
• Build M1 Wheels / pytorch/executorch / upload / wheel-py3_9-cpu (gh) (#4309)
  ##[error]Unable to find any artifacts for the associated workflow

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