Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/gmp-source/mpz/get_d.c

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+/* double mpz_get_d (mpz_t src) -- Return the double approximation to SRC.
+
+Copyright 1996, 1997, 2000-2003 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"
+
+double
+mpz_get_d (mpz_srcptr z)
+{
+  mp_size_t size;
+
+  size = SIZ (z);
+  if (UNLIKELY (size == 0))
+    return 0.0;
+
+  return mpn_get_d (PTR (z), ABS (size), size, 0L);
+}