PR/45506. No new options added. Notable changes:
*) Bugfix: a segmentation fault might occur in a worker process if
resolver got a big DNS response.
*) Feature: accept filters are now supported on NetBSD.
*) Bugfix: a segmentation fault occurred on start or while
reconfiguration if the "ssl" directive was used at http level and
there was no "ssl_certificate" defined.
*) Bugfix: nginx hogged CPU if all servers in an upstream were marked as
"down".
*) Bugfix: a segmentation fault might occur during reconfiguration if
ssl_session_cache was defined but not used in previous configuration.
*) Bugfix: a segmentation fault might occur in a worker process if many
backup servers were used in an upstream.
*) Feature: now nginx supports ECDHE key exchange ciphers.
*) Change: now default SSL ciphers are "HIGH:!aNULL:!MD5".
*) Bugfix: a segmentation fault might occur in a worker process, if a
caching was used.
*) Bugfix: worker processes may got caught in an endless loop during
reconfiguration, if a caching was used; the bug had appeared in 0.8.48.
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