Use <atf_srcdir>/truncate_test.root_owned instead of /usr/bin/fpr as fpr does
not exist on FreeBSD

truncate_test.root_owned will be generated at build time and owned by root

In collaboration with: pho
Sponsored by: EMC / Isilon Storage Division
- Mark sig/signo __unused
- Do not provide a relative path via #include "h_macros.h"

Sponsored by: EMC / Isilon Storage Division