[PATCH] shell: fix $(()) precedence bug in "X=A?B:C" (it is _not_ "(X=A)?..)"

[Steffen Nurpmeso]

Xabier Oneca -- xOneca wrote in
 <CACkgH73XahR89TXC9esdfnAAD6AWnHSnPqTM4Vgu==_Kag1-cw at mail.gmail.com>:
 |busybox tree has no file named "shexp-arith.h",
 |> yet your patch is against that file.
 |>
 |> Do you see this file here?
 |> https://git.busybox.net/busybox/tree/shell
 |
 |
 |That file is added in one of his first patches a while ago. Later, he has
 |sent patches fixing bugs for that unapplied patch. I think the confussion
 |comes from this.

v4 is an all-in-one again.
Sorry for the many misses.

--steffen
|
|Der Kragenbaer,                The moon bear,
|der holt sich munter           he cheerfully and one by one
|einen nach dem anderen runter  wa.ks himself off
|(By Robert Gernhardt)