[RFC] Fetch gflags dynamically

[jathu]

Summary

I recently learned about FetchContent. This seems like a nicer solution than using submodules. Thoughts?

Test plan

CI

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/11285

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❌ 11 New Failures, 4 Unrelated Failures

As of commit 54685fa with merge base 09a4b9d ():

NEW FAILURES - The following jobs have failed:

• pull / test-static-llama-qnn-linux / linux-job (gh)
  RuntimeError: Command docker exec -t b804e1bbf41aec90f67f0f934f933d2e52f8c9cd5eecf1f533cde3df3b8ec8dd /exec failed with exit code 2
• trunk / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t 9e17e7f16d64c93deac2dc06f0c9efd3eb80359e6d163df06eef175665b639f5 /exec failed with exit code 2
• trunk / test-llama-runner-qnn-linux (fp32, qnn_8a8w, qnn) / linux-job (gh)
  RuntimeError: Command docker exec -t fb4b3e57e75ea4d7017e329bcc7025ec81661d0b93ef796e2cd8ccdf498fe9fa /exec failed with exit code 2
• trunk / test-qnn-model (fp32, dl3) / linux-job (gh)
  RuntimeError: Command docker exec -t d8889e2e2accf469a46b1813c7949099c69c09c0f3b2a5ac0797963b19e5fb62 /exec failed with exit code 2
• trunk / test-qnn-model (fp32, ic3) / linux-job (gh)
  RuntimeError: Command docker exec -t 1c149baf66c023c117045342d92644e65a29b0d01c75ea066d3baa6e8c6a2e44 /exec failed with exit code 2
• trunk / test-qnn-model (fp32, ic4) / linux-job (gh)
  RuntimeError: Command docker exec -t b61284eb48f61256077684afca15bf1772e48f692221c7e66a05aefa894c4911 /exec failed with exit code 2
• trunk / test-qnn-model (fp32, mb) / linux-job (gh)
  RuntimeError: Command docker exec -t db252d37df1d5b141964f33fb88d4ec57359177658536ba1bb08449f58996a0d /exec failed with exit code 2
• trunk / test-qnn-model (fp32, mv2) / linux-job (gh)
  RuntimeError: Command docker exec -t 82a210ae56462a80c8b698876247069e6f1850c33a4f0035f4389aa953a3ac85 /exec failed with exit code 2
• trunk / test-qnn-model (fp32, mv3) / linux-job (gh)
  RuntimeError: Command docker exec -t 3793d3cfd11aba2b5fc1e35effe31a7c2bc8feb9ae4995f535552a8bb6d8f0be /exec failed with exit code 2
• trunk / test-qnn-model (fp32, vit) / linux-job (gh)
  RuntimeError: Command docker exec -t 5f9a18bd847b85b0315722220bb3b22975338aa68a8bfc50984887a69ef659ae /exec failed with exit code 2
• trunk / test-qnn-model (fp32, w2l) / linux-job (gh)
  RuntimeError: Command docker exec -t a77d8792d581a980f71ed1287b534c7525040ab325f5f49b81b97dc4f0020d6b /exec failed with exit code 2

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• pull / test-llama-runner-qnn-linux (fp32, qnn_16a16w, qnn) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-llama-runner-qnn-linux (fp32, qnn_8a8w, qnn) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / test-models-linux (mv2, portable, linux.2xlarge) / linux-job (gh) (detected as infra flaky with no log or failing log classifier)
• pull / unittest-buck / linux / linux-job (gh) (detected as infra flaky with no log or failing log classifier)

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[jathu]

nit: lets not log, it's too noisy — do we really need to tell them every time?