Merge branch 'nd/fbsd-lazy-mtime' into maint

FreeBSD can lie when asked mtime of a directory, which made the
untracked cache code to fall back to a slow-path, which in turn
caused tests in t7063 to fail because it wanted to verify the
behaviour of the fast-path.

* nd/fbsd-lazy-mtime:
t7063: work around FreeBSD's lazy mtime update feature

diff --cc t/t7063-status-untracked-cache.sh
Simple merge