adding a Run Script to verify libs are built as Universal

... and fixing the cases for otest-query*-osx where the lib was only
built as x86_64 in debug mode.
switching xctool to use the clang-as-ios-dylib workaround.

We can now retire the iOS-Simulator-Dylib.xcconfig stuff.
remove support for running GC-enabled tests.

Xcode 5.1 will drop support for building GC-enabled binaries, so we
should drop it in Xcode, too.
fix leak in ArchiveAction