SPDY: avoid sending RST_STREAM on WINDOW_UPDATE with unknown SID. There's a race condition between closing a stream by one endpoint and sending a WINDOW_UPDATE frame by another. So it would be better to just skip such frames for unknown streams, like is already done for the DATA frames.

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


have=NGX_SUPPRESS_WARN . auto/have

have=NGX_SMP . auto/have