fix function defs for function that take vsn(), which can be an atom
fix function defs for function that take vsn(), which can be an atom

Licenser/relx,RJ/relx,erlware/relx,umatomba/relx,timclassic/relx,bitwalker/relx,lrascao/relx,tsloughter/relx,ethercrow/relx,priestjim/relx,zugolosian/relx,bsmr-erlang/relx,syl20bnr/relx,ingwinlu/relx