Dispatch iOS 12.4 to 13.0 API Differences

base.h

Added #def DISPATCH_FREEBSD_UNAVAILABLE

Added #def DISPATCH_COLD

Added #def DISPATCH_OPTIONS

object.h

Added dispatch_set_qos_class_floor()

queue.h

Added dispatch_async_and_wait()

Added dispatch_async_and_wait_f()

Added dispatch_barrier_async_and_wait()

Added dispatch_barrier_async_and_wait_f()

source.h

Added dispatch_source_mach_recv_flags_t

workloop.h

Added dispatch_workloop_t

Added OS_dispatch_workloop

Added dispatch_workloop_create()

Added dispatch_workloop_create_inactive()

Added dispatch_workloop_set_autorelease_frequency()