WebKit top of tree sources won't build in 10.9 w/ Xcode 6.0.1

WebKit top of tree sources won't build in 10.9 w/ Xcode 6.0.1
https://bugs.webkit.org/show_bug.cgi?id=137053

Reviewed by Mark Rowe.

.:

* WebKit.xcworkspace/xcshareddata/xcschemes/All Source (target WebProcess).xcscheme:
In the build pre-action, pass the --wksi and --llvm options to
copy-webkitlibraries-to-product-directory.
* WebKit.xcworkspace/xcshareddata/xcschemes/All Source.xcscheme: Ditto.

Websites/webkit.org:

* building/build.html: Removed instructions how to work around this bug, now that it’s fixed.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@174034 268f45cc-cd09-0410-ab3c-d52691b4dbfc