Patch to add --warn-error flag to ld

[Alan Modra]

On 29 Mar 2001, J.T. Conklin wrote:

> That being the case, should I change --warn-errors to --fatal-warnings
> before checking the change in?  This appears is a GNU standard, at
> least M4 supports --fatal-warnings as well.

Yet the GNU flagship, GCC, uses -Werror.  :-)  Thanks for checking over
your patch again.  Do please change to --fatal-warnings.

Alan
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