[OE-core] backfill mechanism

[Slater, Joseph]

The backfill mechanism is not compatible with multilib.  This could possibly be fixed, but the backfill_considered functionality is also obscure, so I think in at least the machine related .inc files we should replace lines like

MACHINE_FEATURES_BACKFILL_CONSIDERED_append = " ${@bb.utils.contains('TUNE_FEATURES', 'n32', 'qemu-usermode', '', d)}"

with lines like

MACHINE_FEATURES_remove_mipsarchn32 = " qemu-usermode"

There are two advantages:  the second line works for multilib, and it is far more readable.

Joe

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