pw_env_setup: Remove cargo support This was only used to get PyOxidizer for pw_env_setup distribution which is no longer supported. Change-Id: I235b9b0207010d876e0db293ceefef21d4c516c6 Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/42900 Pigweed-Auto-Submit: Rob Mohr <mohrr@google.com> Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com> Reviewed-by: Keir Mierle <keir@google.com>
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