[NEW PORT]: sysutils/sysctlinfo-kmod

Kernel module to implement the sysctlinfo interface, it explores
the sysctl tree to pass the info of the nodes to the userland;
a header file with constants and helper macros is provided, too.

WWW: https://gitlab.com/alfix/sysctlinfo

PR: 240390
Submitted by: Alfonso S. Siciliano <alfix86@gmail.com>