rpm: Add nativesdk to BBCLASSEXTEND

rpm: Add nativesdk to BBCLASSEXTEND

Modified FILES-paths since nativesdk can't handle hardcoded paths,
Also added *.real binaries to packaging since this is not done when built
as native.

As far as /var having to be hardcoded, I have a hard time seeing someone
modifying bitbake.conf to place localstatedir somewhere else than /var.

If there exists a target/nativesdk portable way of hardcoding FILES,
please let me know, and we'll do it that way.

Cleanup of FEATURES, since it was the same for native & target.

(From OE-Core rev: 39383e9bf1aa5e29d33d8af7f8e690d2238fd14f)

Signed-off-by: David Nyström <david.nystrom@enea.com>
Signed-off-by: Saul Wold <sgw@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>