CoreFoundation: optimize TimeZone PLIST loading on Windows
CoreFoundation: optimize TimeZone PLIST loading on Windows

Use `CFDataCreateWithBytesNoCopy` to avoid the memory copy for the
construction of the `CFData`.

Thanks to Gwynne Raskind for educating me on the fact that
`CFDataCreate` will actually perform a copy which I was trying to avoid.

apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,e78l/swift-corelibs-foundation,e78l/swift-corelibs-foundation,e78l/swift-corelibs-foundation,apple/swift-corelibs-foundation,e78l/swift-corelibs-foundation,apple/swift-corelibs-foundation,apple/swift-corelibs-foundation,e78l/swift-corelibs-foundation