build: suppress clang errors building libffi on Windows

Signed-off-by: Renegade334 <contact.9a5d6388@renegade334.me.uk>
PR-URL: #64222
Refs: #64040
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>
Reviewed-By: Stefan Stojanovic <stefan.stojanovic@janeasystems.com>
Reviewed-By: Richard Lau <richard.lau@ibm.com>

Author: Renegade334

deps/libffi/libffi.gyp

@@ -204,6 +204,13 @@
         },
       ],
       'conditions': [
+        ['OS == "win" and clang == 1', {
+          'msvs_settings': {
+            'VCCLCompilerTool': {
+              'AdditionalOptions': ['-Wno-incompatible-pointer-types'],
+            },
+          },
+        }],
         ['OS == "win" and (target_arch == "x64" or target_arch == "x86_64")', {
           'actions': [
             {