Revert "Remove gmp from AOS"

This reverts commit f37c97684f0910a3f241394549392f00145ab0f7.

We need gmp for SymEngine for symbolicmanipultion in C++

Change-Id: Ia13216d1715cf96944f7b4f422b7a799f921d4a4
Signed-off-by: Austin Schuh <austin.linux@gmail.com>
diff --git a/third_party/gmp/mpz/out_str.c b/third_party/gmp/mpz/out_str.c
new file mode 100644
index 0000000..b1d8ae8
--- /dev/null
+++ b/third_party/gmp/mpz/out_str.c
@@ -0,0 +1,108 @@
+/* mpz_out_str(stream, base, integer) -- Output to STREAM the multi prec.
+   integer INTEGER in base BASE.
+
+Copyright 1991, 1993, 1994, 1996, 2001, 2005, 2011, 2012, 2017 Free
+Software Foundation, Inc.
+
+This file is part of the GNU MP Library.
+
+The GNU MP Library is free software; you can redistribute it and/or modify
+it under the terms of either:
+
+  * the GNU Lesser General Public License as published by the Free
+    Software Foundation; either version 3 of the License, or (at your
+    option) any later version.
+
+or
+
+  * the GNU General Public License as published by the Free Software
+    Foundation; either version 2 of the License, or (at your option) any
+    later version.
+
+or both in parallel, as here.
+
+The GNU MP Library is distributed in the hope that it will be useful, but
+WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+for more details.
+
+You should have received copies of the GNU General Public License and the
+GNU Lesser General Public License along with the GNU MP Library.  If not,
+see https://www.gnu.org/licenses/.  */
+
+#include <stdio.h>
+#include "gmp-impl.h"
+#include "longlong.h"
+
+size_t
+mpz_out_str (FILE *stream, int base, mpz_srcptr x)
+{
+  mp_ptr xp;
+  mp_size_t x_size = SIZ (x);
+  unsigned char *str;
+  size_t str_size;
+  size_t i;
+  size_t written;
+  const char *num_to_text;
+  TMP_DECL;
+
+  if (stream == 0)
+    stream = stdout;
+
+  num_to_text = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
+  if (base > 1)
+    {
+      if (base <= 36)
+	num_to_text = "0123456789abcdefghijklmnopqrstuvwxyz";
+      else if (UNLIKELY (base > 62))
+	    return 0;
+    }
+  else if (base > -2)
+    {
+      base = 10;
+    }
+  else
+    {
+      base = -base;
+      if (UNLIKELY (base > 36))
+	return 0;
+    }
+
+  written = 0;
+
+  if (x_size < 0)
+    {
+      fputc ('-', stream);
+      x_size = -x_size;
+      written = 1;
+    }
+
+  TMP_MARK;
+
+  DIGITS_IN_BASE_PER_LIMB (str_size, x_size, base);
+  str_size += 3;
+  str = (unsigned char *) TMP_ALLOC (str_size);
+
+  xp = PTR (x);
+  if (! POW2_P (base))
+    {
+      xp = TMP_ALLOC_LIMBS (x_size | 1);  /* |1 in case x_size==0 */
+      MPN_COPY (xp, PTR (x), x_size);
+    }
+
+  str_size = mpn_get_str (str, base, xp, x_size);
+
+  /* Convert result to printable chars.  */
+  for (i = 0; i < str_size; i++)
+    str[i] = num_to_text[str[i]];
+  str[str_size] = 0;
+
+  {
+    size_t fwret;
+    fwret = fwrite ((char *) str, 1, str_size, stream);
+    written += fwret;
+  }
+
+  TMP_FREE;
+  return ferror (stream) ? 0 : written;
+}