cairo/canvas.go
func (v *Context) SetLineJoin(lineJoin LineJoin) {
	C.cairo_set_line_join(v.native(), C.cairo_line_join_t(lineJoin))
}
func (v *Context) SetLineJoin(lineJoin LineJoin) {
	C.cairo_set_line_join(v.native(), C.cairo_line_join_t(lineJoin))
}
// SetLineJoin is a wrapper around cairo_set_line_join().