Import code from previous AssetBuilder version

thirdparty/libtommath/bn_mp_set_int.c

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+#include "tommath_private.h"
+#ifdef BN_MP_SET_INT_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
+ */
+
+/* set a 32-bit const */
+int mp_set_int(mp_int *a, unsigned long b)
+{
+   int     x, res;
+
+   mp_zero(a);
+
+   /* set four bits at a time */
+   for (x = 0; x < 8; x++) {
+      /* shift the number up four bits */
+      if ((res = mp_mul_2d(a, 4, a)) != MP_OKAY) {
+         return res;
+      }
+
+      /* OR in the top four bits of the source */
+      a->dp[0] |= (mp_digit)(b >> 28) & 15uL;
+
+      /* shift the source up to the next four bits */
+      b <<= 4;
+
+      /* ensure that digits are not clamped off */
+      a->used += 1;
+   }
+   mp_clamp(a);
+   return MP_OKAY;
+}
+#endif
+
+/* ref:         HEAD -> master, tag: v1.1.0 */
+/* git commit:  08549ad6bc8b0cede0b357a9c341c5c6473a9c55 */
+/* commit time: 2019-01-28 20:32:32 +0100 */