Buffer overrun in GMP functions mpz_root, mpz_rootrem

[Torbjorn Granlund]

There is a buffer overrun in the internal GMP function
mpn_rootrem, affecting the pblic functions mpz_root and
mpz_rootrem.  The potential overrun is a function of input
operand size, i.e., with large operands the overrun can be large.

The patch below addresses the problem.

The following GMP releases are affected: 4.1, 4.1.1, 4.1.2,
4.1.3, and 4.1.4.

(All followups to the bugs or discuss list, as appropriate, please.)

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Torbj?rn