remove unused _swift_dispatch_apply_current_root_queue symbol

Signed-off-by: Daniel A. Steffen <[email protected]>

Author: das

src/swift/Queue.swift

@@ -344,8 +344,5 @@ internal func _swift_dispatch_queue_concurrent() -> dispatch_queue_attr_t
 @_silgen_name("_swift_dispatch_get_main_queue")
 internal func _swift_dispatch_get_main_queue() -> dispatch_queue_t
 
-@_silgen_name("_swift_dispatch_apply_current_root_queue")
-internal func _swift_dispatch_apply_current_root_queue() -> dispatch_queue_t
-
 @_silgen_name("_swift_dispatch_apply_current")
 internal func _swift_dispatch_apply_current(_ iterations: Int, _ block: @convention(block) (Int) -> Void)