Change define for a mac compatible one.

src/snark/src/algebra/fields/bigint.tcc

@@ -19,7 +19,7 @@ namespace libsnark {
 template<mp_size_t n>
 bigint<n>::bigint(const unsigned long long x) /// Initalize from a small integer
 {
-    static_assert(ULONG_LONG_MAX <= GMP_NUMB_MAX, "unsigned long long does not fit in a GMP limb");
+    static_assert(ULLONG_MAX <= GMP_NUMB_MAX, "unsigned long long does not fit in a GMP limb");
     this->data[0] = x;
 }