Event pipe: disabled c->read->available checking for SSL. In SSL connections, data can be buffered by the SSL layer, and it is wrong to avoid doing c->recv_chain() if c->read->available is 0 and c->read->pending_eof is set. And tests show that the optimization in question indeed can result in incorrect detection of premature connection close if upstream closes the connection without sending a close notify alert at the same time. Fix is to disable c->read->available optimization for SSL connections.

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


ngx_include="unistd.h";      . auto/include
ngx_include="inttypes.h";    . auto/include
ngx_include="limits.h";      . auto/include
ngx_include="sys/filio.h";   . auto/include
ngx_include="sys/param.h";   . auto/include
ngx_include="sys/mount.h";   . auto/include
ngx_include="sys/statvfs.h"; . auto/include
ngx_include="crypt.h";       . auto/include