https://gitlab.synchro.net/main/sbbs/-/commit/58f9d4750803538cc29a9af1
Modified Files:
src/conio/scale.c xbr.c
Log Message:
More scaling cleanup... no undefined behaviour

Remove undefined behaviour (right-shifting a negative integer) from
the scaler... replace with divide-by-2. Any modern compiler should
be able to optimize that.

On the enabling the compiler front, const-ify more variables and
use types that allow removing some casts.

I have a bit more hope this will fix the macOS issue than the previous
efforts.

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