Patch for config.guess and config.sub for vNonStop platform

[Randall S. Becker]

Hello GNU,

I am one of the platform maintainers for HPE NonStop Open Source projects
and have been asked by the team I represent to submit config.guess and
config.sub changes for the latest HPE Virtualized NonStop (a.k.a. vNonStop).
Without meaning to cause problems, I created a pull request at githubL
https://github.com/gcc-mirror/gcc/pull/17. Please let me know if this is
acceptable or whether you would like the old-style forms to be followed. I
do not want to end up with a merge conflict. I also corrected an error with
the NonStop NSX definition.

Sincerely,
Randall

-- Brief whoami: 
 NonStop developer since approximately NonStop(211288444200000000) 
 UNIX developer since approximately 421664400 
-- In my real life, I talk too much.