def out_extensions(self):
        """
        Add support for rc and res files.
        """
        return {
            **super().out_extensions,
            **{ext: ext + self.obj_extension for ext in ('.res', '.rc')},
        }

        Add support for rc and res files.
        
product/gradle-plugin/src/main/python/setuptools/_distutils/cygwinccompiler.py