Support AOT compilation of imported Go values

[jfhamlin]

in https://github.com/glojurelang/glojure/blob/main/pkg/stdlib/glojure/string.glj, we import several helper functions:

(ns glojure.string
  (:refer-glojure :exclude (replace reverse))
  (:import (regexp *Regexp)
           (github.com$glojurelang$glojure$pkg$lang ToString NewIllegalArgumentError Char CharAt)))

Problem

when generating go from the resulting namespace, we can't identify the qualified names for the function values and fail code generation