Compiler failure: Cannot run Haxe code in a non-Haxe thread

```
Haxe: 4.2.5; OS type: windows;
File "src/macro/eval/evalContext.ml", line 332, characters 51-58
```

Context:
Breakpoint debugging on a build macro in vscode interp target

Start at src/macro/eval/evalContext.ml, line 332, and reproduce the failure in the reported VS Code breakpoint-debugging setup for a build macro using the interp target. Done means the compiler no longer fails with “Cannot run Haxe code in a non-Haxe thread” in that context.

Written by the indexing model from the issue text.