[RFC] Use fputc in place of putc to avoid -Wunused-value warning.

[Joel Brobecker]

> On Tue, May 07, 2013 at 07:32:11AM -0400, Joel Brobecker wrote:
> >         * bfd.c (_bfd_default_error_handler): Replace use of putc
> >         by fputc.  Add comment explaining why.
> 
> OK.

Thank you, Alan. Checked in.

-- 
Joel