Update NSString.path(withComponents:) API

This update is to match Darwin

Author: keith

Foundation/NSPathUtilities.swift

@@ -199,7 +199,7 @@ extension NSString {
 #endif
     }
 
-    public static func pathWithComponents(_ components: [String]) -> String {
+    public static func path(withComponents components: [String]) -> String {
         var result = ""
         for comp in components.prefix(components.count - 1) {
             result = result._stringByAppendingPathComponent(comp._stringByFixingSlashes(), doneAppending: false)

Foundation/NSURL.swift

@@ -705,7 +705,7 @@ extension NSURL {
     /* The following methods work on the path portion of a URL in the same manner that the NSPathUtilities methods on NSString do.
     */
     open class func fileURL(withPathComponents components: [String]) -> URL? {
-        let path = NSString.pathWithComponents(components)
+        let path = NSString.path(withComponents: components)
         if components.last == "/" {
             return URL(fileURLWithPath: path, isDirectory: true)
         } else {