small patch to fix android ndk build of busybox

[Hin-Tak Leung]

Hi,

I cannot see why or since when this change is needed since the last time I built busybox ( a few months ago), as neither configs/android2_defconfig nor libpwdgrp nor libbb has changed much recently; but the change seems to be correct or at least should cause no harm, so here it is.

Cheers,
Hin-Tak
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