feat(gnovm/pkg/gnolang): add build constraints to fail on 32-bit architectures

[odeke-em]

This change adds build constraints so as to panic if built for 32-bit architectures as it is a project wide decision not to support them.

This allows the mainnet launch without sweating trying to make a bunch of runtime changes for the gnovm.

Updates #3288

[Gno2D2]

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[kristovatlas]

Sounds reasonable. As the gno.land validator set will initially be limited, this probably isn't a pressing action.

[notJoon]

LGTM

remove: review/triage-pending flag

[aeddi]

The idea looks good to me, but please check the comments for some improvements.

[aeddi]

@leohhhn maybe you have a better idea of the right place(s) to add this info?

[thehowl]

definitely shouldn't go in README; maybe in pkg/gnolang/ readme.

Also we should update the goreleaser configuration to avoid 32bit targets.

[thehowl]

suggestion:

package main

import "strconv"

func _() {
	var x [1]struct{}
	_ = x[strconv.IntSize-64]
}

This is a trick used also by stringer. It has the advantage that if the value of strconv.IntSize != 64, then compilation fails entirely (rather than at runtime, as the code in the PR does).

Aside from the code above, you should add some comment to explain the compile error should someone come up with it.

Also the file shouldn't be named _386 to avoid it only building on 386. The code above should be added without any build constraints.