[roll pigweed] pw_toolchain: Fix OSS Fuzz libc++ not found

Excludes OSS Fuzz from using the CIPD-provided sysroot since OSS Fuzz
relies on libc++ (which is not included in the CIPD sysroot) rather than
libstdc++.

Original-Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/106591

https://pigweed.googlesource.com/pigweed/pigweed
pigweed Rolled-Commits: 3bac75d77b9b492..f21618bae2f4464
Roller-URL: https://ci.chromium.org/b/8805739866864525809
CQ-Do-Not-Cancel-Tryjobs: true
Change-Id: I53d6fa4e66fca574bc28efd08a0b15f5ffefbbb0
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/zephyr-integration/+/106558
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: 96c7111569972473d56d366e454d7a961514b93b
  1. .gitmodules
  2. test.sh