<https://webkit.org/b/137308> WebKit should build on OS X Yosemite for external users

<https://webkit.org/b/137308> WebKit should build on OS X Yosemite for external users

Source/WebKit/mac:

Reviewed by Dan Bernstein.

* Configurations/DebugRelease.xcconfig: Use libWebKitSystemInterfaceYosemite.a on Yosemite.

Source/WebKit2:

Reviewed by Dan Bernstein.

* Configurations/DebugRelease.xcconfig: Use libWebKitSystemInterfaceYosemite.a on Yosemite.

Tools:

Reviewed by Dan Bernstein.

* Scripts/copy-webkitlibraries-to-product-directory: Copy libWebKitSystemInterfaceYosemite.a
into the build directory. Use LLVMIncludesYosemite.tar.bz2 and LLVMLibrariesYosemite.tar.bz2
for the LLVM components when on Yosemite.

WebKitLibraries:

Add versions of WebKitSystemInterface and LLVM for Yosemite. The LLVM build is from
LLVM SVN r206312, matching the Mavericks and Mountain Lion builds.

Reviewed by Dan Bernstein.

* LLVMIncludesYosemite.tar.bz2: Added.
* LLVMLibrariesYosemite.tar.bz2: Added.
* WebKitSystemInterface.h:
* libWebKitSystemInterfaceMavericks.a:
* libWebKitSystemInterfaceMountainLion.a:
* libWebKitSystemInterfaceYosemite.a: Added.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@174196 268f45cc-cd09-0410-ab3c-d52691b4dbfc