From flutter/engine#26699

A few issues I've run into.

• usr/bin/env is not where python3 is typically installed on a windows machine, so the shebang line causes a permission error.
• Beyond that, the scripts seem to have some other Exec Format Error.
• running the scripts manually with python3 leads to:
  • fatal: Not a valid object name FETCH_HEAD
  • clang-tidy job failed to run. (due to the paths for clang tidy being incorrect?)

I worked around this by disabling githooks for the repo.

@dnfield @zanderso