Function CGPathAddRelativeArc 

pub unsafe extern "C-unwind" fn CGPathAddRelativeArc(
    path: Option<&CGMutablePath>,
    matrix: *const CGAffineTransform,
    x: CGFloat,
    y: CGFloat,
    radius: CGFloat,
    start_angle: CGFloat,
    delta: CGFloat,
)

👎Deprecated: renamed to CGMutablePath::add_relative_arc

Available on crate feature CGPath only.