Use MPC 1.2.1 in build-many-glibcs.py

[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',

-- 
Joseph S. Myers
joseph@codesourcery.com