add missing win32 constant for old win sdk

Zhao Yuhang

2025-03-11 c00e986f38dbc4843d92cc76a385f826658c1e03

 examples/qml/QWKButton.qml

@@ -20,6 +20,7 @@
            mipmap: true
            width: 12
            height: 12
            fillMode: Image.PreserveAspectFit
        }
    }
    background: Rectangle {