context: no_compression is options, not verify

The OpenSSL 0.9.8 compat needs to be handled as part of the options, not the
verification flags.
context: Incidental cleanup
options: Remove dead code

The workaround for 'no_compression' on older OpenSSL is handled in context.c;
set_option_flag (which uses ssl_options) is never called, so this shouldn't
exist.