Add a version of WebKitSystemInterface for Mavericks.

Add a version of WebKitSystemInterface for Mavericks.

Reviewed by Ryosuke Niwa.

Source/WebKit/mac:

* Configurations/DebugRelease.xcconfig:

Source/WebKit2:

* Configurations/DebugRelease.xcconfig:

Tools:

* DumpRenderTree/mac/Configurations/DebugRelease.xcconfig:
* Scripts/copy-webkitlibraries-to-product-directory:
* WebKitTestRunner/Configurations/DebugRelease.xcconfig:

WebKitLibraries:

* libWebKitSystemInterfaceMavericks.a: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@157770 268f45cc-cd09-0410-ab3c-d52691b4dbfc