pw_env_setup: Use arm-gcc 9 in compatibility.json Use arm-gcc 9 in compatibility.json so we ensure it continues to build upstream Pigweed, since some downstream projects don't want to switch to arm-gcc 10 anytime soon. Change-Id: If9aeba05ccb1d45681394b01efca7cde81c6458b Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/43982 Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com> Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com> Reviewed-by: Keir Mierle <keir@google.com>
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