recipetool: Fix inherit in created -native* recipes

native and nativesdk classes are special and must be inherited last :
put them at the end of the gathered classes to inherit.

Signed-off-by: Yoann Congal <yoann.congal@smile.fr>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit a6614fd8)
Signed-off-by: Steve Sakoman <steve@sakoman.com>