sysutils/extrace: New port: Trace exec() calls system-wide

extrace traces all program executions occurring on a system, or ones
which descend from a specified process. Execution duration and exit
status can be logged.
Useful for debugging and security analysis.

WWW: https://github.com/leahneukirchen/extrace-freebsd

Reported by: Leah Neukirchen (author) via e-mail