Foundation overlay: Deprecate String "PercentEscapesUsingEncoding" methods.
Foundation overlay: Deprecate String "PercentEscapesUsingEncoding" methods.

These have been superseded by newer APIs in Foundation, and Swift should follow suit. rdar://problem/21397308

Swift SVN r30356

apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation