Don't compile, since it needs to be runnable

Author: JukkaL

setup.py

@@ -81,6 +81,7 @@ def run(self) -> None:
             "__main__.py",
             "pyinfo.py",
             os.path.join("dmypy", "__main__.py"),
+            "exportjson.py",
             # Uses __getattr__/__setattr__
             "split_namespace.py",
             # Lies to mypy about code reachability