https://bugs.webkit.org/show_bug.cgi?id=78981

Reviewed by Dan Bernstein.

Source/JavaScriptCore: 

* Configurations/Base.xcconfig:

Source/ThirdParty: 

* gtest/xcode/Config/General.xcconfig:
In addition to enabling libc++ when building with Clang,
disable gtest's use of tr1::tuple, which doesn't exist in
libc++.

Source/ThirdParty/ANGLE: 

* Configurations/Base.xcconfig:

Source/WebCore: 

* Configurations/Base.xcconfig:

Source/WebKit/mac: 

* Configurations/Base.xcconfig:

Source/WebKit2: 

* Configurations/Base.xcconfig:

Tools: 

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


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@108361 268f45cc-cd09-0410-ab3c-d52691b4dbfc