[PATCH 3/3] ash: exec: -a option for setting zeroth arg

[Kang-Che Sung]

Back in January 2017, a person named Patrick Pief has suggested a similar patch
to add "exec -a" support:

http://lists.busybox.net/pipermail/busybox/2017-January/085146.html

Is your patch same as his or is there any difference?