til,til_fb: introduce a noop_per_cpu fragmenter

This is intended to perhaps be of use for threaded rendering that
don't actually produce pixels during their render phase, but
still need n_cpus fragments to dispatch the parallel work keying
off the fragment.number.

Such a renderer might then put its pixels on-screen serially @
finish_frame(), or maybe the rendering functions will get a
return value to trigger multi-pass rendering on the same tick.

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