Have all projects default to building against the OS X Internal SDK for the Production
configuration. For the Debug and Release configurations, look for UseInternalSDK.xcconfig
to determine whether the OS X Internal SDK should be used. If not, use the normal OS X SDK.

Reviewed by Dan Bernstein.

Source/JavaScriptCore:

* Configurations/Base.xcconfig:
* Configurations/DebugRelease.xcconfig:

Source/ThirdParty:

* gtest/xcode/Config/General.xcconfig:
* gtest/xcode/Config/ProductionProject.xcconfig:

Source/ThirdParty/ANGLE:

* Configurations/Base.xcconfig:
* Configurations/DebugRelease.xcconfig:

Source/WebCore:

* Configurations/Base.xcconfig:
* Configurations/DebugRelease.xcconfig:

Source/WebInspectorUI:

* Configurations/Base.xcconfig:
* Configurations/DebugRelease.xcconfig:

Source/WebKit/mac:

* Configurations/Base.xcconfig:
* Configurations/DebugRelease.xcconfig:

Source/WebKit2:

* Configurations/Base.xcconfig:
* Configurations/DebugRelease.xcconfig:

Source/WTF:

* Configurations/Base.xcconfig:
* Configurations/DebugRelease.xcconfig:

Tools:

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

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@157241 268f45cc-cd09-0410-ab3c-d52691b4dbfc