tst_QWebSocket: skip sync-ECONNREFUSED rows on QNX 8.0+

QNX 8.0 rejects loopback connects to non-listening ports (e.g.
127.0.0.1:1) synchronously with ECONNREFUSED, bypassing the
ConnectingState transient that tst_invalidOpen and tst_invalidOrigin
assume to observe between open() and the first errorOccurred signal.
QNX 7.x returns EINPROGRESS as expected. Skip the affected rows on
__QNX__ >= 800.

Pick-to: 6.10 6.11
Change-Id: Ib805cf7124018e0cb685e82908dca9caa3dfc491
Reviewed-by: Mårten Nordheim <marten.nordheim@qt.io>