Add an explicit list of options that can be disabled, enabled, ...
Configure has, so far, had no control at all of which 'no-' options it
can be given. This means that, for example, someone could configure
with something absurd like 'no-stack' and then watch the build crumble
to dust... or file a bug report.
This introduces some sanity into the possible choices.
The added list comes from looking for the explicit ones used in
Configure, and from grepping after OPENSSL_NO_ in all source files.