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/mpq/get_num.c b/third_party/gmp/mpq/get_num.c
new file mode 100644
index 0000000..079211c
--- /dev/null
+++ b/third_party/gmp/mpq/get_num.c
@@ -0,0 +1,44 @@
+ /* mpq_get_num(num,rat_src) -- Set NUM to the numerator of RAT_SRC.
+
+Copyright 1991, 1994, 1995, 2001, 2012 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 "gmp-impl.h"
+
+void
+mpq_get_num (mpz_ptr num, mpq_srcptr src)
+{
+  mp_size_t size = SIZ(NUM(src));
+  mp_size_t abs_size = ABS (size);
+  mp_ptr dp;
+
+  dp = MPZ_NEWALLOC (num, abs_size);
+  SIZ(num) = size;
+
+  MPN_COPY (dp, PTR(NUM(src)), abs_size);
+}