Add availability indicator to XMLElement to indicate correct function.
Add availability indicator to XMLElement to indicate correct function.

The implementation of setAttributesAs was deprecated bfeore the API was
copied over to the Linux implementation, and won't be implemented. By
adding an availability marker coupled with a new name, we allow for a
fix-it to run and use the new name in future compiled code.

amraboelela/swift-corelibs-foundation,JGiola/swift-corelibs-foundation,e78l/swift-corelibs-foundation,johnno1962c/swift-corelibs-foundation,alblue/swift-corelibs-foundation,amraboelela/swift-corelibs-foundation,johnno1962e/swift-corelibs-foundation,johnno1962c/swift-corelibs-foundation,alblue/swift-corelibs-foundation,parkera/swift-corelibs-foundation,johnno1962e/swift-corelibs-foundation,bolshedvorsky/swift-corelibs-foundation,ikesyo/swift-corelibs-foundation,e78l/swift-corelibs-foundation,JGiola/swift-corelibs-foundation,parkera/swift-corelibs-foundation,e78l/swift-corelibs-foundation,mattrajca/swift-corelibs-foundation,amraboelela/swift-corelibs-foundation,e78l/swift-corelibs-foundation,amraboelela/swift-corelibs-foundation,amosavian/swift-corelibs-foundation,parkera/swift-corelibs-foundation,amosavian/swift-corelibs-foundation,bolshedvorsky/swift-corelibs-foundation,amosavian/swift-corelibs-foundation,johnno1962c/swift-corelibs-foundation,parkera/swift-corelibs-foundation,amosavian/swift-corelibs-foundation,johnno1962e/swift-corelibs-foundation,ikesyo/swift-corelibs-foundation,apple/swift-corelibs-foundation,johnno1962c/swift-corelibs-foundation,johnno1962c/swift-corelibs-foundation,johnno1962b/swift-corelibs-foundation,ikesyo/swift-corelibs-foundation,apple/swift-corelibs-foundation,bolshedvorsky/swift-corelibs-foundation,JGiola/swift-corelibs-foundation,johnno1962b/swift-corelibs-foundation,alblue/swift-corelibs-foundation,alblue/swift-corelibs-foundation,apple/swift-corelibs-foundation,amosavian/swift-corelibs-foundation,alblue/swift-corelibs-foundation,JGiola/swift-corelibs-foundation,johnno1962b/swift-corelibs-foundation,johnno1962b/swift-corelibs-foundation,apple/swift-corelibs-foundation,ikesyo/swift-corelibs-foundation,apple/swift-corelibs-foundation,ikesyo/swift-corelibs-foundation,mattrajca/swift-corelibs-foundation,bolshedvorsky/swift-corelibs-foundation,mattrajca/swift-corelibs-foundation,mattrajca/swift-corelibs-foundation,johnno1962e/swift-corelibs-foundation,mattrajca/swift-corelibs-foundation,parkera/swift-corelibs-foundation,bolshedvorsky/swift-corelibs-foundation,amraboelela/swift-corelibs-foundation,e78l/swift-corelibs-foundation,JGiola/swift-corelibs-foundation,johnno1962b/swift-corelibs-foundation,johnno1962e/swift-corelibs-foundation