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Kernel 5.35 4.79.2.186 introduced a bug whereby a logical to physical lookup
would return the wrong value in the bottom 12 bits of the result. Workaround
this by computing that ourselves, otherwise the lookup of &8000 fails with
an unmapped address leading to startnew() jumping to address -1.
Tested on a Risc PC softloading 5.22 on top of 5.20.

Version 1.22. Tagged as 'SoftLoad-1_22'