[Toybox] taskset -c cpu-list support?

[Jesse Rosenstock]

taskset doesn't currently support -c cpu-list.

This is a somewhat nicer way of specifying and printing the CPUs:
`taskset -c 2-4` instead of `taskset 1c`.

https://www.man7.org/linux/man-pages/man1/taskset.1.html

Might you accept a patch to add -c support or is it a conscious simple
> small > full-featured decision?  Maybe you need to see the code and
size diff to know.

The original thread doesn't say either way
http://lists.landley.net/htdig.cgi/toybox-landley.net/2012-July/009773.html