[roll pigweed] pw_toolchain: Add logic to allow RBE for arm_gcc

This adds conditionalized logic for RBE in pigweed for
arm_gcc.

Test: Verified the build worked with and without the
      environment RBE variable being set.
Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/99760

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: 675cc2e415b3084..6e4211ffcbb7a40
Roller-URL: https://ci.chromium.org/b/8806081303589211057
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I6b95d052a725fb1a95152734b103c356294076a1
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/106040
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: 9e4c90ea8043d0ff2fadcffbd237395ee47ee7bb
  1. .gitmodules
  2. test.sh