Revert "mount: fix macOS not noticing errors with --daemon"

Unfortunately this does not compile on all platforms and the fix is
too big for the point release.

This reverts commit 5a22dad9a7.

cmd/mountlib/mount.go

@@ -10,7 +10,6 @@ import (
 	"runtime"
 	"strings"
 	"sync"
-	"syscall"
 	"time"
 
 	"github.com/rclone/rclone/cmd"
@@ -223,13 +222,6 @@ func NewMountCommand(commandName string, hidden bool, mount MountFn) *cobra.Comm
 				err = WaitMountReady(mnt.MountPoint, Opt.DaemonWait)
 				if err != nil {
 					killDaemon("Daemon timed out")
-				} else {
-					// Double check daemon is still alive
-					// on non Linux OSes WaitMountReady is just a no-op
-					err = daemon.Signal(syscall.Signal(0))
-					if err != nil {
-						err = fmt.Errorf("daemon has died: %w", err)
-					}
 				}
 				atexit.Unregister(handle)
 			}