[PATCH] scripts/build-many-glibcs.py: Switch one Arm target to thumb mode

[Florian Weimer]

* Joseph Myers:

> On Wed, 7 Jul 2021, Florian Weimer via Libc-alpha wrote:
>
>> This commit changes arm-linux-gnueabihf-v7a-disable-multi-arch
>> to use thumb mode.  The choice is somewhat arbitrary, but there
>> should be at least one thumb mode target.
>
> My inclination would be to add a new variant for this rather than changing 
> an existing one.

Running build-many-glibcs.py isn't free.  We can't test all possible
combinations, and -mthumb is a real gap.

Can we remove another Arm target instead?

If we absolutely have to add a new target, should it be based on
arm-linux-gnueabi?

Thanks,
Florian