QUIC: automatically add and never delete stream events. Previously, stream events were added and deleted by ngx_handle_read_event() and ngx_handle_write_event() in a way similar to level-triggered events. However, QUIC stream events are effectively edge-triggered and can stay active all time. Moreover, the events are now active since the moment a stream is created.

# Copyright (C) Igor Sysoev
# Copyright (C) Nginx, Inc.


have=NGX_SUPPRESS_WARN . auto/have

have=NGX_SMP . auto/have