Turn DIO_INHOLE() into a function, returning the next select code to probe at;

and skip function codes 132 to 135, inclusive, on models 362 and 382 - this
is a fake DIO device probably intended to let non-SGC aware (i.e. legacy)
HP-UX lowlevel code be able to ``detect'' a frame buffer.

This change (as well as letting sgc attach) is untested due to the lack of any
3x2 hardware, but shouldn't make things worse.

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