Linking failure on aarch64

[FX]

> Fixing that, it builds fine and all checks pass. Thanks!

With the patch, we are seeing an issue when static linking, however:

Undefined symbols for architecture arm64:
  "__gmpn_pi1_bdiv_q_1", referenced from:
      ___gmpn_bdiv_q_1 in libgmp.a(bdiv_q_1.o)
     (maybe you meant: ___gmpn_pi1_bdiv_q_1)
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)


This happens when linking this test source code:

      #include <gmp.h>
      #include <stdlib.h>
      int main() {
        mpz_t i, j, k;
        mpz_init_set_str (i, "1a", 16);
        mpz_init (j);
        mpz_init (k);
        mpz_sqrtrem (j, k, i);
        if (mpz_get_si (j) != 5 || mpz_get_si (k) != 1) abort();
        return 0;
      }


FX