Import code from previous AssetBuilder version

thirdparty/libtommath/bn_mp_jacobi.c

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+#include "tommath_private.h"
+#ifdef BN_MP_JACOBI_C
+/* LibTomMath, multiple-precision integer library -- Tom St Denis
+ *
+ * LibTomMath is a library that provides multiple-precision
+ * integer arithmetic as well as number theoretic functionality.
+ *
+ * The library was designed directly after the MPI library by
+ * Michael Fromberger but has been written from scratch with
+ * additional optimizations in place.
+ *
+ * SPDX-License-Identifier: Unlicense
+ */
+
+/* computes the jacobi c = (a | n) (or Legendre if n is prime)
+ * Kept for legacy reasons, please use mp_kronecker() instead
+ */
+int mp_jacobi(const mp_int *a, const mp_int *n, int *c)
+{
+   /* if a < 0 return MP_VAL */
+   if (mp_isneg(a) == MP_YES) {
+      return MP_VAL;
+   }
+
+   /* if n <= 0 return MP_VAL */
+   if (mp_cmp_d(n, 0uL) != MP_GT) {
+      return MP_VAL;
+   }
+
+   return mp_kronecker(a, n, c);
+}
+#endif
+
+/* ref:         HEAD -> master, tag: v1.1.0 */
+/* git commit:  08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
+/* commit time: 2019-01-28 20:32:32 +0100 */