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

[Nicolas Cellier]

We also have a few UB associated with those negative values
I compiled the VM with CFLAGS, LDFLAGS, BFLAGS and DYFLAGS:
` 		-fsanitize=undefined \`

Then got:
```
../../platforms/Cross/plugins/Squeak3D/b3dMain.c:1249:29: runtime error: left shift of negative value -8
../../platforms/Cross/plugins/Squeak3D/b3dMain.c:1251:25: runtime error: left shift of negative value -8
../../platforms/Cross/plugins/Squeak3D/b3dDraw.c:316:33: runtime error: left shift of negative value -18279
../../platforms/Cross/plugins/Squeak3D/b3dDraw.c:317:33: runtime error: left shift of negative value -18279
../../platforms/Cross/plugins/Squeak3D/b3dDraw.c:318:33: runtime error: left shift of negative value -18279
../../platforms/Cross/plugins/Squeak3D/b3dMain.c:775:40: runtime error: -4.36761e+10 is outside the range of representable values of type 'int'
```

I do not think that it is the source of problem, but yet another potential problem in the future in case of aggressive C compiler optimization... 

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