add feature to dump environment from build.py

This is helpful for extracting the flags passed to sanitizers. It will
also be helpful for debugging build.py issues.

Change-Id: I0a27ae9ba95b8e13a58fceaabd65f4c0323dfbce
1 file changed
tree: a8d5eb38bbb0e972dca071b1c92874ce2f432dc7
  1. aos/
  2. doc/
  3. frc971/
  4. output/
  5. vision/
  6. .clang-format
  7. .gitignore
  8. README.txt