[PATCH] configure: Update --help output for --with-multilib-list

[Jonathan Wakely]

On Wed, 22 Sept 2021 at 23:19, Jim Wilson wrote:

> On Fri, Sep 17, 2021 at 4:39 AM Jonathan Wakely via Gcc-patches <
> gcc-patches@gcc.gnu.org> wrote:
>
>> The list of architectures that support the option is incomplete.
>>
>> gcc/ChangeLog:
>>
>>         * configure.ac: Fix --with-multilib-list description.
>>         * configure: Regenerate.
>>
>> OK for trunk?
>>
>
> Looks like or1k has --with-multilib-list support also.  I'd suggest adding
> that to the list also.  Ok with that change..
>

Thanks, pushed as r12-3840.

I think doc/install.texi should be updated too then, because that's where I
got the list of targets that support it. OR1K isn't there.