Add extension_llm_runner library to executorch-config.cmake

[larryliu0820]

So that we can find it in CMAKE_INSTALL_PREFIX.

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/15129

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❌ 7 New Failures, 1 Unrelated Failure

As of commit 7fe078e with merge base a12219d ():

NEW FAILURES - The following jobs have failed:

• pull / nxp-build-test / linux-job (gh)
  Process completed with exit code 1.
• Test CUDA Builds / export-voxtral-cuda-artifact / linux-job (gh)
  RuntimeError: Command docker exec -t 4f2c4b2c322582cd1d4d90963bc2904cc264ff0cff8f81d888d34df06f61801c /exec failed with exit code 1
• Test CUDA Builds / test-models-cuda (add_mul) / linux-job (gh)
  RuntimeError: Command docker exec -t 4c38e50e4ae807a8a9334458c0a282c9fe1267d240de4aa5656b12a8531087da /exec failed with exit code 1
• Test CUDA Builds / test-models-cuda (add) / linux-job (gh)
  RuntimeError: Command docker exec -t 8997ded8d980dcff8eb7589d3091a89b9f5ce9ebe09c78832b7011e6dbf10f04 /exec failed with exit code 1
• Test CUDA Builds / test-models-cuda (conv1d) / linux-job (gh)
  RuntimeError: Command docker exec -t 3ae78f30b4da62e1007b3d0efbaba87c85797d098c272845f1118e87faa7c838 /exec failed with exit code 1
• Test CUDA Builds / test-models-cuda (linear) / linux-job (gh)
  RuntimeError: Command docker exec -t 9b18b2ceb84c7dbe5edfd73c83b29ac45b5c1b536c9393f8dbda54d085420cd4 /exec failed with exit code 1
• Test CUDA Builds / test-models-cuda (resnet18) / linux-job (gh)
  RuntimeError: Command docker exec -t 399a57750cfeaebb1fc97eb0d18cbf580d94447068f18d8d3bfc509af2adf4ee /exec failed with exit code 1

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

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

• pull / unittest-arm-backend-with-no-fvp (test_pytest_models) / linux-job (gh) (trunk failure)

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