pw_build: Disable CGo on MacOS This tells the Go compiler to build without the C standard library on MacOS due to issues with include paths in certain environments. Change-Id: I33cba8abeb32350af58347afc7c768cc18a31a3d Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/45443 Pigweed-Auto-Submit: Alexei Frolov <frolv@google.com> Commit-Queue: Auto-Submit <auto-submit@pigweed.google.com.iam.gserviceaccount.com> Reviewed-by: Joe Ethier <jethier@google.com>
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