PATCH: Fix native warning

[DJ Delorie]

> So, it boils down to the question if it is ok to use the target
> libiberty compiled with i686-linux-gcc for build.

No, the question is whether the build libiberty can be used (and
perhaps distributed) as the target libiberty.  In general, we don't
care much about how the build libiberty is built, as long as it works.
We care a lot about how the target libiberty is built.