Events: backout eventport changes (r5172) for now.

Evenport method needs more work.  Changes in r5172, while being correct,
introduce various new regressions with current code.

src/event/modules/ngx_eventport_module.c

@@ -530,14 +530,6 @@ ngx_eventport_process_events(ngx_cycle_t *cycle, ngx_msec_t timer,
             rev = c->read;
             wev = c->write;
 
-            if (!rev->active) {
-                revents &= ~POLLIN;
-            }
-
-            if (!wev->active) {
-                revents &= ~POLLOUT;
-            }
-
             rev->active = 0;
             wev->active = 0;