Switch to a new `input.fdopen` API & wrapper so we can keep the fds opened by `fbink_input_scan` instead of closing them to re-open them right after that...
This should hopefully help on racy zForce devices that attempt to handle power management when opening/closing the device. We know this sometimes horribly fail to re-activate the IR grid (c.f., our manual activation on resume), but this apparently could also happen here (re: #11844) because of the quick succession of open->close->open.
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