doc: no need to adopt an alternative to VDKQueue (#6600)

macosx/VDKQueue/VDKQueue.h

@@ -46,7 +46,6 @@
 // - Callbacks are only on the main thread.
 // - Unmaintained as a standalone project.
 
-#warning Adopt an alternative to VDKQueue (UKFSEventsWatcher, EonilFSEvents, FileWatcher, DTFolderMonitor or SFSMonitor)
 // ALTERNATIVES (from archaic to modern)
 //
 //  - FreeBSD 4.1: Kernel Queue API (kevent and kqueue)

macosx/VDKQueue/VDKQueue.mm

@@ -165,7 +165,7 @@ NSString const* VDKQueueAccessRevocationNotification = @"VDKQueueAccessWasRevoke
     }
 }
 
-- (void)watcherThread:(id)sender
+- (void)watcherThread:(id)__unused sender
 {
 #if DEBUG_LOG_THREAD_LIFETIME
     NSLog(@"watcherThread started.");