port-arm/52119: PT_STEP not supported on arm 32-bit

[n54%gmx.com@localhost]

>Number:         52119
>Category:       port-arm
>Synopsis:       PT_STEP not supported on arm 32-bit
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    port-arm-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Mar 28 03:30:00 +0000 2017
>Originator:     Kamil Rytarowski
>Release:        NetBSD 7.99.66 amd64
>Organization:
TNF
>Environment:
NetBSD chieftec 7.99.66 NetBSD 7.99.66 (GENERIC) #3: Tue Mar 28 02:01:26 CEST 2017  root@chieftec:/public/netbsd-root/sys/arch/amd64/compile/GENERIC amd64
>Description:
ptrace(2) PT_STEP is not supported on arm.
>How-To-Repeat:
Try to use it or run t_ptrace_wait* tests.
>Fix:
Implement software emulated PT_STEP.