pointless: Use file patterns to exclude Portage-irrelevant files

I'll subsequently migrate the config over to only use this new way of
specifying irrelevant files (dropping the file basename and folder
exact file path approaches), then I'll drop support in the pointless
build checker for the old ways.

BUG=chromium:965516
TEST=unit tests, local run

Change-Id: I2b1359ee5ab786f207da9656bcf97b32bbae0965
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/test_planner/+/1626670
Commit-Queue: Sean Abraham <seanabraham@chromium.org>
Tested-by: Sean Abraham <seanabraham@chromium.org>
Reviewed-by: Dhanya Ganesh <dhanyaganesh@chromium.org>
6 files changed
tree: 06ea5128495737f68c0a40cb6176a3193a1831a7
  1. .gitignore
  2. LICENSE
  3. OWNERS
  4. cipd.yaml
  5. deploy_cipd.json
  6. deploy_cipd.sh
  7. src/