remove the AR_FLAGS over-ride which broke on Macs (#84)
remove the AR_FLAGS over-ride which broke on Macs (#84)

ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz,ellson/graphviz