[openssl.org #3548] Remove some unsupported platforms

[Rich Salz via RT]

This ticket is a catch-all for removing a handful of unsupported platforms.
This list includes:

BEOS
NeXT
NEWS
SUNOS
MPE/iX
ReliantUNIX
SINIX
DGUX
NCR
Tandem
Cray
WIN16

The intent is that each one will be done as a single commit, separate from all
the others, and merged to main one at a time, but to have only one ticket for
this first round of general platform reduction. Ticket 3540, BEOS, is being
merged into this.
This will be done on master, for part of the next release after 1.0.2

--
Rich Salz, OpenSSL dev team; ***@openssl.org

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