this is a cherrypick from busybox-git HEAD:
f5470419404d643070db99d058405b714695b817

and can be removed when upgrading to
next busybox release. discussion here:
http://lists.busybox.net/pipermail/busybox/2017-May/085439.html



Signed-off-by: Bastian Bittorf <bb@npl.de>