Including <limits.h> in gmp-impl.h

[Vincent Lefevre]

On 2013-12-25 13:28:20 +0100, Torbjorn Granlund wrote:
> IIRC, limits.h was unreliable for many years, and our workarounds
> allowed GMP to work on more systems.

I've tried to find something about that on Google, but couldn't
find anything. Any reference?

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