[roll pigweed] pw_env_setup: Don't assume lib2to3 lib dir exists

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/100462

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: e22c6ffa2374ee9..f6df36c81ed3669
Roller-URL: https://ci.chromium.org/b/8809980375165277377
Cq-Cl-Tag: roller-builder:pigweed-zephyr-roller
Cq-Cl-Tag: roller-bid:8809980375165277377
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: Ia103843812cfaf73e295b7c76d7e2216dd843f56
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/100437
Bot-Commit: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
Commit-Queue: Pigweed Integration Roller <pigweed-integration-roller@pigweed.google.com.iam.gserviceaccount.com>
1 file changed
tree: f5b2f3abc3176aa93fff6b70aaf06c1cf828ba5d
  1. .gitmodules
  2. test.sh