Not able to build WebKit against iOS Simulator 8.3 SDK

Not able to build WebKit against iOS Simulator 8.3 SDK
https://bugs.webkit.org/show_bug.cgi?id=143883

Reviewed by David Kilzer.

Tools:

Copy libraries libWebKitSystemInterfaceIOS{Device, Simulator}8.3.a to the built product directory
so that Xcode uses them.

* Scripts/copy-webkitlibraries-to-product-directory:

WebKitLibraries:

Add WebKitSystemInterface for iOS 8.3.

* libWebKitSystemInterfaceIOSDevice8.3.a: Added.
* libWebKitSystemInterfaceIOSSimulator8.3.a: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@182964 268f45cc-cd09-0410-ab3c-d52691b4dbfc