[Vm-dev] [OpenSmalltalk/opensmalltalk-vm] Squeak3D crash on 64bits VM (#468)

[Nicolas Cellier]

I broke it in https://github.com/OpenSmalltalk/opensmalltalk-vm/pull/448
The function signature was already BADLY inconsistent!
But luckily, the erroneous 64 bits arguments did get copied into 32 bits `dstY` before my fix...
I sort of broke the spell and the magic vanished ;)
Brittle code = hazardous life

What I'm very unsure of now, is if writing at negative offset is a good idea (buffer underflow?), or if this uncovers yet another bug at upper level...
If I just correct function signature, the game seems to work though...

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