Fix CGPath ref issue

Author: Kyle-Ye

Sources/OpenCoreGraphics/CGPath.swift

@@ -8,7 +8,7 @@
 public import Foundation
 
 /// A graphics path is a mathematical description of a series of shapes or lines.
-public struct CGPath {
+public final class CGPath {
 
     public typealias Element = PathElement
 
@@ -20,6 +20,14 @@ public struct CGPath {
     }
 }
 
+public final class CGPathRef {
+    public var path: CGPath
+
+    public init(path: CGPath) {
+        self.path = path
+    }
+}
+
 // MARK: - Supporting Types
 
 /// A path element.