Minify CSS, breaks @supports selector

[AlfonsoML]

Tested using latest master

Describe the bug
Trying to minify CSS that includes @supports selector produces wrong output

To Reproduce

var result = Uglify.Css(@"@supports selector(:has(*)) {
	.VentaRapida {
		position: absolute;
	}
}");

Minified output or stack trace
@supports :has(*)){.VentaRapida{position:absolute;}}

Excepted output code
@supports selector(:has(*)){.VentaRapida{position:absolute;}}