[Toybox] [patch] cp.c to support smack feature of install, mv, cp

[Hyejin Kim]

Hi.


To support smack feature, make modification like below:

1. install -Z context  : this can give new context
2. mv -Z  : this can give current context to destination file
3. cp --preserve=context


Plz, have a look for 2 patches.
First is to treat 1 and 2.
Second is for 3 and has dependency of first patch. Further follows Rob's
"--preserve" parsing logic without any improvement currently.
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