Adding ability to use postinstalls intercepts in the nativesdk env, and
making sure the correlate between repo + SDK.
This to enable rootfs generation from a package repository using only a
package repository and the toolchain tarball.
See https://github.com/nysan/rootfs-sandbox for examples.
(From OE-Core rev: 5d5ef0f5620ec525491c53e8457e7c65c226bfb4)
Signed-off-by: David Nyström <david.nystrom@enea.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>