Use MPC 1.2.1 in build-many-glibcs.py

[Florian Weimer]

* Joseph Myers:

> This patch makes build-many-glibcs.py use the new MPC 1.2.1 release.
>
> Tested with build-many-glibcs.py (host-libraries, compilers and glibcs
> builds).
>
> diff --git a/scripts/build-many-glibcs.py b/scripts/build-many-glibcs.py
> index 1472fba44b..afcbbcfb28 100755
> --- a/scripts/build-many-glibcs.py
> +++ b/scripts/build-many-glibcs.py
> @@ -770,7 +770,7 @@ class Context(object):
>                              'glibc': 'vcs-mainline',
>                              'gmp': '6.2.0',
>                              'linux': '5.9',
> -                            'mpc': '1.2.0',
> +                            'mpc': '1.2.1',
>                              'mpfr': '4.1.0',
>                              'mig': 'vcs-mainline',
>                              'gnumach': 'vcs-mainline',

Looks reasonable to me.  Thanks.

Florian
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