There continue to be parallel make race issues showing up on the autobuilder.
This patch removes some potential sources of these. The rm is unrequired
since we're using cp -f. The || true ensures that if we did race against
someone it becomes harmless.
[YOCTO #1202]
(From OE-Core rev: 32840cd95fcde92433fbb0271b82d0f4048a823a)
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>