for openssl-3 enablement


- Disable the select backend, this can be easily done by lying
  to configure. This is done due to:
  * using fd number > 1024 on an fd_set results in a runtime 
    fortify source assertion, preventing further doom.
  * select will not be changed to handle fd > 1024.
  * this limit is unreasonable low for this century.

- Drop insserv_prereq and fillup_prereq macros: there are no
  pre-scripts that would justify these dependencies.

- Update to 2.1.12 stable
  * buffer: do not pass NULL to memcpy() from evbuffer_pullup()
  * http: fix undefined-shift in EVUTIL_IS*_ helpers
  * Check error code of evhttp_add_header_internal() in
    evhttp_parse_query_impl()
  * http: fix EVHTTP_CON_AUTOFREE in case of timeout
  * evdns: Add additional validation for values of dns options
  * Fix memory corruption in EV_CLOSURE_EVENT_FINALIZE with debug enabled
  * increase segment refcnt only if evbuffer_add_file_segment() succeeds
  * evdns: fix a crash when evdns_base with waiting requests is freed
  * event_base_once: fix potential null pointer threat
  * http: do not assume body for CONNECT
  * evbuffer_add_file: fix freeing of segment in the error path
  * Fix checking return value of the evdns_base_resolv_conf_parse()
  * Support EV_CLOSED on linux for poll(2)
  * Parse IPv6 scope IDs.
  * evutil_time: detect and use _gmtime64_s()/_gmtime64()
  * bufferevent: allow setting priority on socket and openssl type
  * Fix EV_CLOSED detection/reporting
  * Revert "Warn if forked from the event loop during event_reinit()"

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