logging: avoids logging activity to stdio file descriptors (#1007)

This avoids logging activity on stdio file descriptors, in order to help
make troubleshooting easier. Usually, there isn't an issue in these, yet
wasm panics are harder to read if there is also logging of the ..
logging.

Signed-off-by: Adrian Cole <adrian@tetrate.io>

internal/gojs/http.go

@@ -89,7 +89,7 @@ func (s *fetchResult) get(_ context.Context, propertyKey string) interface{} {
 		return h
 	case "body":
 		// return undefined as arrayPromise is more complicated than an array.
-		return undefined
+		return goos.Undefined
 	case "status":
 		return uint32(s.res.StatusCode)
 	}