Similar to native, backfilling of items from DISTRO_FEATURES when
combined with DISTRO_FEATURES_FILTER_NATIVESDK was not functioning
correctly.
Ensure the backfill is applied before filtering, then clear the value to
prevent further backfill. This makes the nativesdk and crosssdk cases
match the native code.
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org> Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com> Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>