Silence compiler warning on

[Ian Lance Taylor]

Mark Kettenis <mark.kettenis@xs4all.nl> writes:

> Index: ChangeLog
> from  Mark Kettenis  <kettenis@jive.nl>
> 
>         * bfd.c (_bfd_abort): Provide prototype for _exit with
>         ATTRIBUTE_NORETURN.

I think something like this should use AC_CHECK_DECLS to avoid a
conflict with the system header files.

Ian