pointless_build: add bool for ignoring non portage relevance

BUG=b:186002205
TEST=./generate.sh

Change-Id: I4e625e48943ba18df3f313659332411086aa7140
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/infra/proto/+/2841738
Commit-Queue: George Engelbrecht <engeg@google.com>
Reviewed-by: LaMont Jones <lamontjones@chromium.org>
2 files changed