[LTP] [PATCH v1 1/4] syscalls/capset01: Cleanup & convert to new library

[Yang Xu]

Hi
> Hi!
> This test was missing the SPDX licence header, I've added it and pushed,
> thanks.
> 
> Also we do not cover the pid == 0 case here either, that should be added
> later on.
> 
Like capget01 discussion, I will add it.