[socket] CMsg header decode on darwin
[socket] CMsg header decode on darwin

The cmsg header (decode) problems on darwin was because the
CMSG_FIRSTHDR macro is "faulty" on old versions (of darwin).
I *think* it should return a NULL-pointer if there are no
cmsg headers (but it does not). So, instead of punishing all
platforms with an explicit test
(msg_controllen >= sizeof(struct cmsghdr)) we only do this
on darwin.

ferd/otp,mikpe/otp,potatosalad/otp,vladdu/otp,rlipscombe/otp,rlipscombe/otp,uabboli/otp,emacsmirror/erlang,isvilen/otp,bsmr-erlang/otp,emacsmirror/erlang,aboroska/otp,vladdu/otp,erlang/otp,potatosalad/otp,dumbbell/otp,isvilen/otp,electricimp/otp,rlipscombe/otp,vinoski/otp,ferd/otp,rlipscombe/otp,g-andrade/otp,rlipscombe/otp,RoadRunnr/otp,mikpe/otp,mikpe/otp,uabboli/otp,lrascao/otp,dumbbell/otp,g-andrade/otp,legoscia/otp,isvilen/otp,lrascao/otp,legoscia/otp,legoscia/otp,kvakvs/otp,erlang/otp,mikpe/otp,isvilen/otp,bsmr-erlang/otp,emacsmirror/erlang,potatosalad/otp,lrascao/otp,isvilen/otp,ferd/otp,isvilen/otp,RoadRunnr/otp,dumbbell/otp,emacsmirror/erlang,vinoski/otp,rlipscombe/otp,dgud/otp,emacsmirror/erlang,getong/otp,erlang/otp,RoadRunnr/otp,jj1bdx/otp,uabboli/otp,bjorng/otp,vladdu/otp,aboroska/otp,bjorng/otp,jj1bdx/otp,ferd/otp,isvilen/otp,mikpe/otp,bsmr-erlang/otp,RoadRunnr/otp,dgud/otp,lrascao/otp,dumbbell/otp,kvakvs/otp,bjorng/otp,dgud/otp,emacsmirror/erlang,jj1bdx/otp,electricimp/otp,uabboli/otp,electricimp/otp,ferd/otp,getong/otp,kvakvs/otp,rlipscombe/otp,emacsmirror/erlang,vinoski/otp,g-andrade/otp,isvilen/otp,kvakvs/otp,dumbbell/otp,jj1bdx/otp,potatosalad/otp,potatosalad/otp,bsmr-erlang/otp,bjorng/otp,legoscia/otp,g-andrade/otp,jj1bdx/otp,ferd/otp,dumbbell/otp,bjorng/otp,bsmr-erlang/otp,erlang/otp,bjorng/otp,uabboli/otp,mikpe/otp,potatosalad/otp,getong/otp,g-andrade/otp,aboroska/otp,lrascao/otp,bjorng/otp,electricimp/otp,bjorng/otp,rlipscombe/otp,electricimp/otp,legoscia/otp,erlang/otp,lrascao/otp,kvakvs/otp,RoadRunnr/otp,vladdu/otp,aboroska/otp,jj1bdx/otp,dgud/otp,RoadRunnr/otp,g-andrade/otp,erlang/otp,kvakvs/otp,ferd/otp,erlang/otp,legoscia/otp,erlang/otp,lrascao/otp,isvilen/otp,potatosalad/otp,dgud/otp,dumbbell/otp,electricimp/otp,dgud/otp,bsmr-erlang/otp,aboroska/otp,vladdu/otp,dgud/otp,emacsmirror/erlang,kvakvs/otp,uabboli/otp,lrascao/otp,potatosalad/otp,jj1bdx/otp,electricimp/otp,aboroska/otp,vinoski/otp,rlipscombe/otp,mikpe/otp,getong/otp,kvakvs/otp,g-andrade/otp,legoscia/otp,getong/otp,dumbbell/otp,erlang/otp,mikpe/otp,vladdu/otp,dgud/otp,vinoski/otp,dumbbell/otp,vladdu/otp,rlipscombe/otp,jj1bdx/otp,vinoski/otp,bjorng/otp,mikpe/otp,RoadRunnr/otp,dgud/otp,erlang/otp,uabboli/otp,vladdu/otp,jj1bdx/otp,g-andrade/otp,vinoski/otp,getong/otp,mikpe/otp,bsmr-erlang/otp,electricimp/otp,electricimp/otp,getong/otp,dumbbell/otp,emacsmirror/erlang,aboroska/otp,getong/otp,isvilen/otp,aboroska/otp,bjorng/otp,vinoski/otp,getong/otp,legoscia/otp,dgud/otp,kvakvs/otp,ferd/otp,g-andrade/otp,potatosalad/otp,jj1bdx/otp,g-andrade/otp,emacsmirror/erlang,lrascao/otp,vladdu/otp,RoadRunnr/otp,bsmr-erlang/otp,ferd/otp,potatosalad/otp,getong/otp,uabboli/otp,aboroska/otp,vinoski/otp,legoscia/otp,uabboli/otp,bsmr-erlang/otp,RoadRunnr/otp,vinoski/otp