Import p5-GTop version 0.16 from pkgsrc-wip.

Import p5-GTop version 0.16 from pkgsrc-wip.
Packaged by Aleksey Cheusov and requested in PR 35469.

This Perl extension implements the BSD process resource limit functions
        getrusage()     getrlimit()     setrlimit()
and the BSD process priority functions.  These are available also via
core Perl but here we do more tricks so that the PRIO_* are available.
        getpriority()   setpriority()
Also is provided
        times()
which provides the same functionality as the one in core Perl, only
with better time resolution.