Events: removed unused flags from the ngx_event_s structure.

They are not used since 708f8bb772ec (pre 0.0.1).

src/event/ngx_event.h

diff --git a/src/event/ngx_event.h b/src/event/ngx_event.h
index 93c457c..122b538 100644
--- a/src/event/ngx_event.h
+++ b/src/event/ngx_event.h
@@ -69,10 +69,6 @@
 
     unsigned         delayed:1;
 
-    unsigned         read_discarded:1;
-
-    unsigned         unexpected_eof:1;
-
     unsigned         deferred_accept:1;
 
     /* the pending eof reported by kqueue or in aio chain operation */