Now that sx(9) locks support an interruptible lock acquire primitive,

properly observe the SB_NOINTR flag in sblock.  This restores the
required behavior that lock acquisition be interruptible on the socket
buffer I/O serialization lock to allow threads waiting for I/O to be
signaled even if they aren't the thread currently holding the I/O lock.
With this change, the sblock regression test is again passed.

Reported by:		alfred
sx(9) handiwork:	attilio

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