[TLS] set SSL_PROTOCOL, SSL_CIPHER* (fixes #2511)

[TLS] set SSL_PROTOCOL, SSL_CIPHER* (fixes #2511)

initialized for mod_magnet and dynamic CGI-like handlers
(mod_cgi, mod_fastcgi, mod_scgi, mod_ssi) (*not* mod_proxy)

Note: in the future a config flag (does not yet exist) might be required
to activate initialization of these SSL_* env variables.  This might
occur if there are requests to access these variables in mod_accesslog,
and/or if more SSL_* varables are created, which would be more work.

x-ref:
  "pass protocol and cipher details to fcgi env"
  https://redmine.lighttpd.net/issues/2511