In-tree GMP tarballs lacks the CVE-2021-43618 patch
Most linux distros patch GMP-6.2.1 with https://gmplib.org/repo/gmp-6.2/rev/561a9c25298e, which fixes CVE-2021-43618 that affects 32-bit platforms. Before GMP does another release, we should also include this patch into
gmp-tarballs and bump the submodule accordingly.
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