We've already tweaked remove() for speed and not to error if it
races for deletion. Therefore use this for prunedir() which was
starting to show the same bug reports.
[YOCTO #13003]
(Bitbake rev: 47f359f9b017f8d99d0bb2161ac0dcefcbd915de)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>