test: vendor node-is-valid-window (#39965)

spec/is-valid-window/binding.gyp

@@ -0,0 +1,41 @@
+{
+  'target_defaults': {
+    'conditions': [
+      ['OS=="win"', {
+        'msvs_disabled_warnings': [
+          4530,  # C++ exception handler used, but unwind semantics are not enabled
+          4506,  # no definition for inline function
+        ],
+      }],
+    ],
+  },
+  'targets': [
+    {
+      'target_name': 'is_valid_window',
+      'sources': [
+        'src/impl.h',
+        'src/main.cc',
+      ],
+      'conditions': [
+        ['OS=="win"', {
+          'sources': [
+            'src/impl_win.cc',
+          ],
+        }],
+        ['OS=="mac"', {
+          'sources': [
+            'src/impl_darwin.mm',
+          ],
+          'libraries': [
+            '$(SDKROOT)/System/Library/Frameworks/AppKit.framework',
+          ],
+        }],
+        ['OS not in ["mac", "win"]', {
+          'sources': [
+            'src/impl_posix.cc',
+          ],
+        }],
+      ],
+    }
+  ]
+}