[avih] configure: support custom ar with --ar=
[avih] configure: support custom ar with --ar=

    Author: Avi Halachmi (:avih)
    Date:   Mon Nov 2 18:46:32 2015 +0200

    configure: support custom ar with --ar=

seyko2/tinycc,seyko2/tinycc,seyko2/tinycc,seyko2/tinycc,seyko2/tinycc