Add Chromium-only Blender WebEngine parity work

blender-5.2.0/extern/gmp-source/scanf/vsscanf.c

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+/* gmp_vsscanf -- formatted input from a string.
+
+Copyright 2001, 2002 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 <stdarg.h>
+
+#include <string.h>
+
+#include "gmp-impl.h"
+
+
+int
+gmp_vsscanf (const char *s, const char *fmt, va_list ap)
+{
+#if SSCANF_WRITABLE_INPUT
+  /* We only actually need this if there's standard C types in fmt, and if
+     "s" is not already writable, but it's too much trouble to check that,
+     and in any case this writable sscanf input business is only for a few
+     old systems. */
+  size_t size;
+  char   *alloc;
+  int    ret;
+  size = strlen (s) + 1;
+  alloc = __GMP_ALLOCATE_FUNC_TYPE (size, char);
+  memcpy (alloc, s, size);
+  s = alloc;
+  ret = __gmp_doscan (&__gmp_sscanf_funs, (void *) &s, fmt, ap);
+  (*__gmp_free_func) (alloc, size);
+  return ret;
+
+#else
+  return __gmp_doscan (&__gmp_sscanf_funs, (void *) &s, fmt, ap);
+#endif
+}