bug#10598: 24.0.92; run dired-do-async-shell-command on multiple files individually

[Juri Linkov]

> Thanks a lot, this looks great to me (and also works for me as expected).

Thanks, installed and closed.

> It would be good if the info node "(emacs)Shell Commands in Dired"
> will be updated, too.

A NEWS entry for this change has no "---" indication that means
it should be documented in the manual before the next release when
the functionality is stabilized and there are no more code changes.