BLD: Don't require gfortran on OSX either
BLD: Don't require gfortran on OSX either

magne-max/zipline-ja,wilsonkichoi/zipline,enigmampc/catalyst,alphaBenj/zipline,bartosh/zipline,alphaBenj/zipline,bartosh/zipline,humdings/zipline,Scapogo/zipline,wilsonkichoi/zipline,enigmampc/catalyst,magne-max/zipline-ja,Scapogo/zipline,quantopian/zipline,humdings/zipline,quantopian/zipline,florentchandelier/zipline,florentchandelier/zipline