FileProvider iOS 13.2 to 13.4 API Differences

NSFileProviderDefines.h

Added #def FILEPROVIDER_SPI_AVAILABILITY

Added #def FILEPROVIDER_CLASS_AVAILABILITY

Added #def FILEPROVIDER_API_AVAILABILITY_V2

Added #def FILEPROVIDER_API_AVAILABILITY_V3

Added #def FILEPROVIDER_API_DEPRECATED_V3