Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/gmp-source/mpn/README

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+Copyright 1996, 1999 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/.
+
+
+
+
+This directory contains all code for the mpn layer of GMP.
+
+Most subdirectories contain machine-dependent code, written in assembly or C.
+The `generic' subdirectory contains default code, used when there is no
+machine-dependent replacement for a particular machine.
+
+There is one subdirectory for each ISA family.  Note that e.g., 32-bit SPARC
+and 64-bit SPARC are very different ISA's, and thus cannot share any code.
+
+A particular compile will only use code from one subdirectory, and the
+`generic' subdirectory.  The ISA-specific subdirectories contain hierachies of
+directories for various architecture variants and implementations; the
+top-most level contains code that runs correctly on all variants.