`int` should change size based on target system

[JalonSolov]

In Go, int is 32-bit on 32-bit targets, 64-bit on 64-bit targets. V's int should follow these same rules.

Alex has stated (on Discord) that this is an intended change.

I would like to see this change made sooner, rather than later, as it affects other tools such as go2v, which currently changes int to isize in the V code, to force the types to work the same between the languages.

Once this change it made, that forced type change will no longer be required.

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[huly-for-github[bot]]

Connected to Huly®: V_0.6-24411

[Delta456]

-d new_int allows int size to be changed based on the target system.