HBSD PTRACE: jailify ptrace hardening

github-issue: #76
Signed-off-by: Oliver Pinter <oliver.pinter@hardenedbsd.org>
HBSD PTRACE: paxify ptrace hardening

github-issue: #60 #76
Signed-off-by: Oliver Pinter <oliver.pinter@hardenedbsd.org>
HBSD PTRACE: fix preprocessor expression

github-issue: #60 #76
Signed-off-by: Oliver Pinter <oliver.pinter@hardenedbsd.org>