socket: fix compat for 4.1 v6 sockets

It turns out 4.1 is even more broken than expected. While both 4.1 and
4.2 need to jigger the sysctl nob temporarily, it turns out that in 4.1
it's looking in the wrong namespace for the nob value. So, we have to
account for the different namespace semantics in the different versions.
Super ugly. But, all this code goes away once we upstream.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

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