kill findunref
- it's single-threaded and not run in parallel with anything (started by
nightly after build is complete
- it requires atime to be enabled
- it is hopelessly naive in implementation: it performs a file tree
walk, and for every file encountered, calls fnmatch() a number of times
equal to 'git ls-files | wc -l' to find out if the file is under version
control
the problem it purports to solve is worth neither the time it's wasting
when running nor the time it would take to improve it.