tcp: Revert reset of deferred accept changes in 2.6.26

tcp: Revert reset of deferred accept changes in 2.6.26

Ingo's system is still seeing strange behavior, and he
reports that is goes away if the rest of the deferred
accept changes are reverted too.

Therefore this reverts 6409b422cd89d5e97d75ce7fd7c38b6ad11f50b5
("[TCP]: TCP_DEFER_ACCEPT updates - dont retxmt synack") and
c97b4a8fce0e66d0dc656003a63691c7617b874a ("[TCP]: TCP_DEFER_ACCEPT
updates - defer timeout conflicts with max_thresh").

Just like the other revert, these ideas can be revisited for
2.6.27

Signed-off-by: David S. Miller <davem@davemloft.net>