port-i386/51561: Illegal instruction on Vortex86SX

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>Number:         51561
>Category:       port-i386
>Synopsis:       Illegal instruction on Vortex86SX
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    port-i386-maintainer
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Oct 18 13:55:00 +0000 2016
>Originator:     Natalia Portillo
>Release:        7.0.1
>Organization:
>Environment:
>Description:
Several precompiled packages of NetBSD 7.0.1 fail with illegal instruction.

While the kernel itself boots flawlessly there are several parts failing.
Installing works up to the point of configuration, that never gets executed leaving a partial non-working installation.

Installing on another machine and moving the storage to Vortex86SX makes an unbootable system because several of the boot processes crash with "Illegal instruction", among them ps and sshd.
>How-To-Repeat:
Use a Vortex86SX cpu.
>Fix: