LibBSD | Add KDTRACE support (#87)

[Chris Johns (@chris)]

Chris Johns created an issue: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/87

Assignee: Chris Johns

Add:

1. The ability to build with `KDTRACE_HOOKS` 
2. Add FreebSD `KDTRACE` support files.
3. Provide a simple probe and an `ltrace` command to access the probe data

The support to trace the probes. It does not attempt to do anything close to what `dtrace` can do. A full `dtrace` needs CTF format support and specific target back end support and that is a massive task. The purpose of this support is to get at the runtime probe support built into FreeBSD.

-- 
View it on GitLab: https://gitlab.rtems.org/rtems/pkg/rtems-libbsd/-/issues/87
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