What backport is it ?
Fix comment, removed unnecessary #include, and fixed libevent filter.
Build Bitcoin-ABC / Diffs / Diff Testing failed.
Set the fallback at the toochain file level rather than the library.
Will request for review after the gitian build succeeded.
Rebase and set defaults to allow running the scripts standalone.
Superseeded by D3871 stack.
Fix braces and various othe small changes