autoconf: Extend to provide nativesdk recipe

autoconf: Extend to provide nativesdk recipe

As the same reason with automake, extend autoconf to provide
nativesdk recipe too.

This patch was only used for autoconf that running on target:
    * path_prog_fixes.patch: replace '@PERL@' with '@bindir@/env perl'

It's unavailable for autoconf-native and autoconf-nativesdk, so
exclude it for those two recipes.

Signed-off-by: Wenzong Fan <wenzong.fan@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>