pw_build: Detect test.cc as a test file Change-Id: I77de3edb6ee5a46b476771584f16c669d6ba40ba Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/45340 Pigweed-Auto-Submit: Wyatt Hepler <hepler@google.com> Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com> Reviewed-by: Vic Yang <victoryang@google.com>
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