Cannot build WebKit for iOS device using Xcode 7.3/iOS 9.3 public SDK due to missing

Cannot build WebKit for iOS device using Xcode 7.3/iOS 9.3 public SDK due to missing
private frameworks and libraries
https://bugs.webkit.org/show_bug.cgi?id=155931
<rdar://problem/25807989>

Reviewed by Dan Bernstein.

Source/JavaScriptCore:

Add directory WebKitLibraries/WebKitPrivateFrameworkStubs/iOS/X to the framework search path
where X is the major version of the active iOS SDK.

* Configurations/Base.xcconfig:

Source/WebCore:

Add directory WebKitLibraries/WebKitPrivateFrameworkStubs/iOS/X to the framework search path
where X is the major version of the active iOS SDK.

* Configurations/WebCore.xcconfig:

Source/WebKit/mac:

Add directory WebKitLibraries/WebKitPrivateFrameworkStubs/iOS/X to the framework search path
where X is the major version of the active iOS SDK.

* Configurations/WebKitLegacy.xcconfig:

Source/WebKit2:

Add directory WebKitLibraries/WebKitPrivateFrameworkStubs/iOS/X to the framework search path
where X is the major version of the active iOS SDK.

* Configurations/BaseTarget.xcconfig:

Tools:

Add directory WebKitLibraries/WebKitPrivateFrameworkStubs/iOS/X to the framework search path
where X is the major version of the active iOS SDK.

* DumpRenderTree/mac/Configurations/Base.xcconfig:
* WebKitTestRunner/Configurations/Base.xcconfig:

WebKitLibraries:

Add text-based stubs for private frameworks in iOS 9 and iOS 10 beta.

* WebKitPrivateFrameworkStubs: Added.
* WebKitPrivateFrameworkStubs/iOS: Added.
* WebKitPrivateFrameworkStubs/iOS/10: Added.
* WebKitPrivateFrameworkStubs/iOS/10/AppSupport.framework: Added.
* WebKitPrivateFrameworkStubs/iOS/10/AppSupport.framework/AppSupport.tbd: Added.
* WebKitPrivateFrameworkStubs/iOS/10/AssertionServices.framework: Added.
* WebKitPrivateFrameworkStubs/iOS/10/AssertionServices.framework/AssertionServices.tbd: Added.
* WebKitPrivateFrameworkStubs/iOS/10/CorePDF.framework: Added.
* WebKitPrivateFrameworkStubs/iOS/10/CorePDF.framework/CorePDF.tbd: Added.
* WebKitPrivateFrameworkStubs/iOS/10/GraphicsServices.framework: Added.
* WebKitPrivateFrameworkStubs/iOS/10/GraphicsServices.framework/GraphicsServices.tbd: Added.
* WebKitPrivateFrameworkStubs/iOS/10/IOSurface.framework: Added.
* WebKitPrivateFrameworkStubs/iOS/10/IOSurface.framework/IOSurface.tbd: Added.
* WebKitPrivateFrameworkStubs/iOS/9: Added.
* WebKitPrivateFrameworkStubs/iOS/9/AppSupport.framework: Added.
* WebKitPrivateFrameworkStubs/iOS/9/AppSupport.framework/AppSupport.tbd: Added.
* WebKitPrivateFrameworkStubs/iOS/9/AssertionServices.framework: Added.
* WebKitPrivateFrameworkStubs/iOS/9/AssertionServices.framework/AssertionServices.tbd: Added.
* WebKitPrivateFrameworkStubs/iOS/9/CorePDF.framework: Added.
* WebKitPrivateFrameworkStubs/iOS/9/CorePDF.framework/CorePDF.tbd: Added.
* WebKitPrivateFrameworkStubs/iOS/9/GraphicsServices.framework: Added.
* WebKitPrivateFrameworkStubs/iOS/9/GraphicsServices.framework/GraphicsServices.tbd: Added.
* WebKitPrivateFrameworkStubs/iOS/9/IOSurface.framework: Added.
* WebKitPrivateFrameworkStubs/iOS/9/IOSurface.framework/IOSurface.tbd: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@204471 268f45cc-cd09-0410-ab3c-d52691b4dbfc