mini-gmp mpz_{get,set}_d not fully compatible with GMP

[Vincent Lefevre]

On 2018-03-12 18:53:37 +0100, Marco Bodrato wrote:
> double
> mpz_get_d (const mpz_t u)
> {
>   static int c = 0;
>   static int __initialized = 0;
> 
>   if (__initialized != 1) {
>     c = gmp_tests_dbl_mant_bits ();
>     *((volatile int *) &__initialized) = 1;
>   }

FYI, this is not thread-safe.

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