Further simplify SceneKit overlay by adding private extension to CGFloat.

Author: tkremenek

stdlib/public/SDK/SceneKit/SceneKit.swift

@@ -15,6 +15,9 @@
 // MARK: Exposing SCNFloat
 
 #if os(OSX)
+private extension CGFloat {
+   init(_ x: CGFloat) { self = x }
+}
 public typealias SCNFloat = CGFloat
 #elseif os(iOS) || os(tvOS)
 public typealias SCNFloat = Float
@@ -29,15 +32,9 @@ extension SCNVector3 {
     self.z = SCNFloat(z)
   }
   public init(_ x: CGFloat, _ y: CGFloat, _ z: CGFloat) {
-#if os(OSX)
-    self.x = x
-    self.y = y
-    self.z = z
-#elseif os(iOS) || os(tvOS)
     self.x = SCNFloat(x)
     self.y = SCNFloat(y)
     self.z = SCNFloat(z)
-#endif
   }
   public init(_ x: Double, _ y: Double, _ z: Double) {
     self.init(SCNFloat(x), SCNFloat(y), SCNFloat(z))