Add error logging to scripts/print_exported_headers

[swolchok]

No description provided.

[swolchok]

Stack from ghstack (oldest at bottom):

• -> Add error logging to scripts/print_exported_headers #13686
• Reapply "Add check_for_installed_private_headers_in_cmake_out" (#13485) #13880

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/executorch/13686

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❌ 5 New Failures, 1 Unrelated Failure

As of commit 3c75a2d with merge base be65301 ():

NEW FAILURES - The following jobs have failed:

• Build documentation / build (buck2) / Build doc (gh)
  At least one of the pre-conditions you specified did not hold
• Build Presets / windows (pybind) / build (gh)
  Process completed with exit code 1.
• Build Presets / windows (windows) / build (gh)
  Process completed with exit code 1.
• pull / unittest / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script failed with exit code 1
• pull / unittest-editable / macos / macos-job (gh)
  RuntimeError: Command bash /Users/ec2-user/runner/_work/_temp/exec_script 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-nxp-neutron / linux-job (gh) (trunk failure)
  test_split_group_convolution__applied_by_default

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[jackzhxng]

Does this need to be imported?

[swolchok]

https://github.com/pytorch/executorch/actions/runs/17416104660/job/49444945169?pr=13686#step:9:20480

stderr: b'[2025-09-02T22:56:22.386+00:00] Build ID: bbf65f19-5632-4134-922b-d34d84471178\nCommand failed: \nError in configured node dependency, dependency chain follows (-> indicates depends on, ^ indicates same configuration as previous):\n       root//extension/llm/runner:multimodal_runner_lib (prelude//platforms:default#200212f73efcd57d)\n    -> root//extension/llm/runner:text_token_generator (^)\n    -> root//extension/llm/tokenizers:headers (^)\n\n\nCaused by:\n    0: looking up unconfigured target node `root//extension/llm/tokenizers:headers`\n    1: Error loading targets in package `root//extension/llm/tokenizers` for target `root//extension/llm/tokenizers:headers`\n    2: package `root//extension/llm/tokenizers:` does not exist\n           missing `TARGETS` file (also missing alternatives `TARGETS.v2`, `TARGETS`)\n'

hmm.