backport patches for gmp-4.x.x

[Rongqing Li]

Torbjorn Granlund:

we am using the gmp-4.2.1, but compiling gmp failed on mips64
and 64bit userspace, I see the patch 12418[(mips, powerpc):
Provide assembly-free umul_ppmm for newer gcc] can fix it. but
it is under GPLv3;

Could you release this patch under GPLv2?

Thanks

-Roy
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