Description:
------------
When shutting down ssh connexion, there should be a time_wait 
state of the socket, but here, a close_wait state remains, and 
they accumulate until CPU and networking saturation ...

I think jbrady recommendation on BUG ID 9500 (concerning ssh2) 
should be reconsidered and ifdef and closesocket() windows 
directives should be implemented ...

Thx in advance

Reproduce code:
---------------
$session=ssh2_connect(...)
...
$stream=ssh2_exec(...)
...
...
...
fclose($stream)
...



Expected result:
----------------
ssh2 orders are ok but when fclose is fired, sockets remains 
in close_wait state waiting for an untunable timeout

Actual result:
--------------
Proto	Local Address	Foreign Address	State
TCP	hope:3708	 nixserver:22	 CLOSE_WAIT
TCP	hope:4750	 nixserver:22	 CLOSE_WAIT
TCP	hope:5250	 nixserver:22	 CLOSE_WAIT
TCP	hope:4890	 nixserver:22	 CLOSE_WAIT
TCP	hope:2467	 nixserver:22	 CLOSE_WAIT
TCP	hope:5120	 nixserver:22	 CLOSE_WAIT
TCP	hope:8769	 nixserver:22	 CLOSE_WAIT