Correct io_vec handling
Correct io_vec handling

Can not depend on internal knowledge of binaries any more
it changed and caused at least opengl to crash in OTP-20.1

uabboli/otp,rlipscombe/otp,vinoski/otp,kvakvs/otp,saleyn/otp,potatosalad/otp,vinoski/otp,jj1bdx/otp,falkevik/otp,cobusc/otp,dumbbell/otp,RaimoNiskanen/otp,dgud/otp,legoscia/otp,bernardd/otp,emacsmirror/erlang,potatosalad/otp,erlang/otp,bsmr-erlang/otp,bjorng/otp,emacsmirror/erlang,vinoski/otp,aboroska/otp,uabboli/otp,bernardd/otp,dumbbell/otp,fenollp/otp,cobusc/otp,matwey/otp,RoadRunnr/otp,g-andrade/otp,isvilen/otp,RaimoNiskanen/otp,tuncer/otp,matwey/otp,matwey/otp,dumbbell/otp,electricimp/otp,legoscia/otp,saleyn/otp,tuncer/otp,dgud/otp,lrascao/otp,RaimoNiskanen/otp,fenollp/otp,dumbbell/otp,lrascao/otp,bernardd/otp,bjorng/otp,lrascao/otp,getong/otp,vinoski/otp,dumbbell/otp,dumbbell/otp,bsmr-erlang/otp,kvakvs/otp,jj1bdx/otp,fenollp/otp,rlipscombe/otp,isvilen/otp,potatosalad/otp,falkevik/otp,falkevik/otp,uabboli/otp,aboroska/otp,falkevik/otp,g-andrade/otp,getong/otp,falkevik/otp,erlang/otp,dgud/otp,g-andrade/otp,mikpe/otp,RaimoNiskanen/otp,legoscia/otp,tuncer/otp,vladdu/otp,ferd/otp,legoscia/otp,bjorng/otp,jj1bdx/otp,vladdu/otp,matwey/otp,lrascao/otp,bsmr-erlang/otp,getong/otp,ferd/otp,vinoski/otp,cobusc/otp,getong/otp,bsmr-erlang/otp,electricimp/otp,rlipscombe/otp,bjorng/otp,bsmr-erlang/otp,electricimp/otp,vinoski/otp,bernardd/otp,saleyn/otp,isvilen/otp,potatosalad/otp,vinoski/otp,potatosalad/otp,kvakvs/otp,lrascao/otp,tuncer/otp,electricimp/otp,dumbbell/otp,isvilen/otp,bernardd/otp,mikpe/otp,saleyn/otp,dgud/otp,fenollp/otp,cobusc/otp,kvakvs/otp,dgud/otp,tuncer/otp,dumbbell/otp,matwey/otp,mikpe/otp,RoadRunnr/otp,mikpe/otp,dgud/otp,RaimoNiskanen/otp,emacsmirror/erlang,emacsmirror/erlang,dgud/otp,lrascao/otp,erlang/otp,bjorng/otp,isvilen/otp,aboroska/otp,ferd/otp,vinoski/otp,jj1bdx/otp,fenollp/otp,jj1bdx/otp,matwey/otp,isvilen/otp,legoscia/otp,vladdu/otp,dumbbell/otp,isvilen/otp,fenollp/otp,falkevik/otp,rlipscombe/otp,bjorng/otp,legoscia/otp,aboroska/otp,RaimoNiskanen/otp,matwey/otp,uabboli/otp,lrascao/otp,ferd/otp,fenollp/otp,kvakvs/otp,rlipscombe/otp,bjorng/otp,rlipscombe/otp,saleyn/otp,falkevik/otp,RaimoNiskanen/otp,dgud/otp,vladdu/otp,jj1bdx/otp,vinoski/otp,electricimp/otp,g-andrade/otp,RoadRunnr/otp,cobusc/otp,getong/otp,saleyn/otp,uabboli/otp,emacsmirror/erlang,aboroska/otp,mikpe/otp,cobusc/otp,fenollp/otp,uabboli/otp,erlang/otp,bsmr-erlang/otp,kvakvs/otp,bernardd/otp,aboroska/otp,potatosalad/otp,jj1bdx/otp,rlipscombe/otp,bsmr-erlang/otp,g-andrade/otp,kvakvs/otp,getong/otp,legoscia/otp,aboroska/otp,isvilen/otp,jj1bdx/otp,getong/otp,mikpe/otp,potatosalad/otp,mikpe/otp,legoscia/otp,bjorng/otp,kvakvs/otp,aboroska/otp,rlipscombe/otp,vinoski/otp,tuncer/otp,getong/otp,potatosalad/otp,tuncer/otp,g-andrade/otp,RoadRunnr/otp,kvakvs/otp,emacsmirror/erlang,erlang/otp,saleyn/otp,lrascao/otp,vladdu/otp,bjorng/otp,bernardd/otp,ferd/otp,vladdu/otp,vladdu/otp,RoadRunnr/otp,g-andrade/otp,getong/otp,electricimp/otp,jj1bdx/otp,RaimoNiskanen/otp,fenollp/otp,lrascao/otp,mikpe/otp,tuncer/otp,ferd/otp,RoadRunnr/otp,bernardd/otp,cobusc/otp,erlang/otp,cobusc/otp,rlipscombe/otp,electricimp/otp,matwey/otp,RoadRunnr/otp,ferd/otp,erlang/otp,RaimoNiskanen/otp,matwey/otp,aboroska/otp,ferd/otp,vladdu/otp,vladdu/otp,potatosalad/otp,electricimp/otp,uabboli/otp,bjorng/otp,isvilen/otp,rlipscombe/otp,uabboli/otp,erlang/otp,g-andrade/otp,dgud/otp,emacsmirror/erlang,saleyn/otp,mikpe/otp,bernardd/otp,jj1bdx/otp,uabboli/otp,bsmr-erlang/otp,emacsmirror/erlang,electricimp/otp,ferd/otp,dgud/otp,saleyn/otp,getong/otp,legoscia/otp,emacsmirror/erlang,erlang/otp,RoadRunnr/otp,dumbbell/otp,RoadRunnr/otp,erlang/otp,emacsmirror/erlang,bsmr-erlang/otp,tuncer/otp,potatosalad/otp,mikpe/otp,isvilen/otp,falkevik/otp,g-andrade/otp,falkevik/otp,g-andrade/otp