Add Chromium-only Blender WebEngine parity work

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

@@ -0,0 +1,39 @@
+/* mpz_swap (dest_integer, src_integer) -- Swap U and V.
+
+Copyright 1997, 1998, 2001, 2012, 2015 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
+mpz_swap (mpz_ptr u, mpz_ptr v) __GMP_NOTHROW
+{
+  MP_SIZE_T_SWAP (ALLOC(u), ALLOC(v));
+  MP_SIZE_T_SWAP (SIZ(u), SIZ(v));
+  MP_PTR_SWAP (PTR(v), PTR(u));
+}