python/m5/config.py:
Allow proxies to refer to other proxies and resolve by recurseivly calling unproxy().
Not sure this works completely (since I don't have any examples to test it on)
but it doesn't seem to break any existing config scripts.
--HG--
extra : convert_revision : d7fc272d0777d85f89104dfb5d1c5e4d8ddd6d6f