[gmp 3.1.1] LONG_MAX and ULONG_MAX redefined

[Vincent Lefevre]

Hi,

In GMP 3.1.1, gmp-impl.h defines LONG_MAX and ULONG_MAX, though these
macros should be defined in <limits.h>, and this is a problem when a
program using gmp-impl.h includes <limits.h> later (e.g. MPFR).

To avoid such errors, gmp-impl.h should include <limits.h> at the
beginning.

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