lib/oe/package: Ensure strip breaks hardlinks

Normally, strip preserves hardlinks which in the case of the way our hardlink
rather than copy functionality works, is a disadvantage and leads to non-deterministic
builds. This adds a move into place after the strip operation to ensure hardlinks
are broken and we bring back build determinism.

Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
Signed-off-by: Ross Burton <ross.burton@intel.com>