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

…itectures

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

README.md

@@ -116,3 +116,6 @@ repository offers more resources to dig into. We are eager to see your first PR!
   * [![Go Reference](https://pkg.go.dev/badge/hey/google)](https://gnolang.github.io/gno/github.com/gnolang/gno.html) \
     (pkg.go.dev will not show our repository as it has a license it doesn't recognise)
 </details>
+
+## Declarations
+* Gno is only available for 64-bit architectures!

gnovm/pkg/gnolang/nocompile_386.go

@@ -0,0 +1,13 @@
+//go:build 386
+
+// Please note that the above build constraint is redundant
+// if the name of the file has the suffix "*_386.go" but just
+// in case someone is overly zealous and renames this file,
+// that guard will ensure that the desired outcomes are achieved.
+
+package gnolang
+
+func init() {
+	// Please see https://github.com/gnolang/gno/issues/3288
+	panic("Gno is not supported on 32-bit machines!")
+}