Fix mkdir race
Fix mkdir race

Creating examples/code and examples/dict in parallel can fail when
examples doesn't exists. This has been seen on FreeBSD.

lightcyphers/otp,lucafavatella/otp,paladim/otp,jemsbhai/otp,sammoth-wazoku/otp,lrascao/otp,schlagert/otp,falkevik/otp,jinshana/otp,weisslj/otp,bugs-erlang-org/otp,psyeugenic/otp,bsmr-erlang/otp,cnbin/otp,awetzel/otp,basho/otp,johanclaesson/otp,hairyhum/otp,falkevik/otp,RGafiyatullin/otp,RGafiyatullin/otp,lrascao/otp,Teino1978-Corp/otp,saleyn/otp,ferd/otp,palas/otp,ferd/otp,getong/otp,dumbbell/otp,ahmedshafeeq/otp,stolen/otp,vic/otp,massemanet/otp,theom/otp,jemsbhai/otp,vinoski/otp,isvilen/otp,NOMORECOFFEE/otp,bsmr-erlang/otp,Teino1978-Corp/otp,jamesruan/otp,vladdu/otp,c-rack/otp,Teino1978-Corp/erlang-otp,hairyhum/otp,stolen/otp,derek121/otp,mikpe/otp,neeraj9/otp,cobusc/otp,jinshana/otp,tuncer/otp,sdebnath/otp,jemsbhai/otp,msantos/otp,emile/otp,bernardd/otp,vic/otp,GinjaNinja32/otp,goertzenator/otp,ahmedshafeeq/otp,potatosalad/otp,aboroska/otp,falkevik/otp,entropiae/otp,uabboli/otp,lhslll/otp,mikpe/otp,VincentHHL/otp,sitexa/otp,beni55/otp,Teino1978-Corp/erlang-otp,emacsmirror/erlang,stolen/otp,release-project/otp,lemenkov/otp,bjorng/otp,saleyn/otp,basho/otp,aboroska/otp,cnbin/otp,haguenau/otp,johanclaesson/otp,RJ/otp,klarna/otp,getong/otp,weisslj/otp,lightcyphers/otp,gjaldon/otp,RJ/otp,RoadRunnr/otp,mikpe/otp,massemanet/otp,cobusc/otp,lemenkov/otp,VincentHHL/otp,rlipscombe/otp,sammoth-wazoku/otp,matwey/otp,saleyn/otp,bjorng/otp,johanclaesson/otp,RaimoNiskanen/otp,emacsmirror/erlang,schlagert/otp,GinjaNinja32/otp,tuncer/otp,sdebnath/otp,jemsbhai/otp,ader1990/otp,g-andrade/otp,psyeugenic/otp,RoadRunnr/otp,isvilen/otp,Teino1978-Corp/erlang-otp,psyeugenic/otp,yangchengjian/otp,lightcyphers/otp,vinoski/otp,lantti/otp,jemsbhai/otp,sitexa/otp,paulcager/otp,RichMorin/otp,electricimp/otp,krishnakumar4a4/otp,GinjaNinja32/otp,g-andrade/otp,entropiae/otp,hairyhum/otp,legoscia/otp,theom/otp,uabboli/otp,matwey/otp,lightcyphers/otp,psyeugenic/otp,jinshana/otp,ader1990/otp,lemenkov/otp,falkevik/otp,goertzenator/otp,vic/otp,enikki/otp,lantti/otp,isvilen/otp,bugs-erlang-org/otp,saleyn/otp,electricimp/otp,paladim/otp,massemanet/otp,kvakvs/otp,RichMorin/otp,cnbin/otp,aboroska/otp,kvakvs/otp,VincentHHL/otp,paulcager/otp,bsmr-erlang/otp,isvilen/otp,release-project/otp,paulcager/otp,krishnakumar4a4/otp,bsmr-erlang/otp,entropiae/otp,jj1bdx/otp,mujiatong/otp,yangchengjian/otp,tuncer/otp,lhslll/otp,neeraj9/otp,g-andrade/otp,release-project/otp,isvilen/otp,lemenkov/otp,lrascao/otp,emile/otp,uabboli/otp,GinjaNinja32/otp,sitexa/otp,lhslll/otp,bjorng/otp,rlipscombe/otp,sdebnath/otp,falkevik/otp,jj1bdx/otp,beni55/otp,paladim/otp,Teino1978-Corp/otp,jj1bdx/otp,msantos/otp,basho/otp,lrascao/otp,vladdu/otp,legoscia/otp,dgud/otp,vic/otp,psyeugenic/otp,neeraj9/otp,sammoth-wazoku/otp,johanclaesson/otp,mikpe/otp,msantos/otp,klarna/otp,ferd/otp,haguenau/otp,fenollp/otp,bernardd/otp,falkevik/otp,Teino1978-Corp/otp,RichMorin/otp,msantos/otp,g-andrade/otp,jj1bdx/otp,bugs-erlang-org/otp,haguenau/otp,RGafiyatullin/otp,bugs-erlang-org/otp,massemanet/otp,yangchengjian/otp,massemanet/otp,uabboli/otp,lucafavatella/otp,msantos/otp,benoitc/otp-1,ader1990/otp,legoscia/otp,potatosalad/otp,RoadRunnr/otp,lucafavatella/otp,erlang/otp,schlagert/otp,dgud/otp,RJ/otp,release-project/otp,NOMORECOFFEE/otp,krishnakumar4a4/otp,erlang/otp,marquisthunder/otp,paladim/otp,platinumthinker/otp,lianghaivv/otp,lianghaivv/otp,krishnakumar4a4/otp,RaimoNiskanen/otp,palas/otp,lucafavatella/otp,aboroska/otp,NOMORECOFFEE/otp,ahmedshafeeq/otp,beni55/otp,potatosalad/otp,electricimp/otp,lhslll/otp,emacsmirror/erlang,goertzenator/otp,goertzenator/otp,NOMORECOFFEE/otp,sitexa/otp,isvilen/otp,lhslll/otp,NOMORECOFFEE/otp,riverrun/otp,kvakvs/otp,ferd/otp,gjaldon/otp,lightcyphers/otp,fenollp/otp,paladim/otp,cobusc/otp,stolen/otp,johanclaesson/otp,klarna/otp,sdebnath/otp,bernardd/otp,bugs-erlang-org/otp,vinoski/otp,ahmedshafeeq/otp,enikki/otp,klarna/otp,marquisthunder/otp,mikpe/otp,johanclaesson/otp,jamesruan/otp,lantti/otp,enikki/otp,mujiatong/otp,marquisthunder/otp,emile/otp,rlipscombe/otp,yangchengjian/otp,NOMORECOFFEE/otp,vladdu/otp,stolen/otp,basho/otp,c-rack/otp,falkevik/otp,dgud/otp,bernardd/otp,benoitc/otp-1,dgud/otp,goertzenator/otp,derek121/otp,derek121/otp,jamesruan/otp,c-rack/otp,fenollp/otp,lucafavatella/otp,RoadRunnr/otp,jj1bdx/otp,matwey/otp,bugs-erlang-org/otp,psyeugenic/otp,lhslll/otp,goertzenator/otp,RJ/otp,jinshana/otp,haguenau/otp,RoadRunnr/otp,sammoth-wazoku/otp,emacsmirror/erlang,release-project/otp,RJ/otp,riverrun/otp,theom/otp,aboroska/otp,ader1990/otp,lhslll/otp,sitexa/otp,enikki/otp,dumbbell/otp,isvilen/otp,legoscia/otp,weisslj/otp,ferd/otp,marquisthunder/otp,g-andrade/otp,emile/otp,bernardd/otp,tuncer/otp,RichMorin/otp,RGafiyatullin/otp,bsmr-erlang/otp,RGafiyatullin/otp,schlagert/otp,lianghaivv/otp,kvakvs/otp,RaimoNiskanen/otp,c-rack/otp,RGafiyatullin/otp,msantos/otp,haguenau/otp,weisslj/otp,getong/otp,electricimp/otp,jj1bdx/otp,saleyn/otp,haguenau/otp,benoitc/otp-1,Teino1978-Corp/erlang-otp,beni55/otp,benoitc/otp-1,c-rack/otp,derek121/otp,gjaldon/otp,erlang/otp,legoscia/otp,saleyn/otp,bernardd/otp,dumbbell/otp,RaimoNiskanen/otp,kvakvs/otp,potatosalad/otp,Teino1978-Corp/otp,dumbbell/otp,enikki/otp,lantti/otp,marquisthunder/otp,vic/otp,sitexa/otp,bjorng/otp,enikki/otp,marquisthunder/otp,g-andrade/otp,vladdu/otp,riverrun/otp,Teino1978-Corp/otp,Teino1978-Corp/otp,mikpe/otp,getong/otp,basho/otp,potatosalad/otp,entropiae/otp,rlipscombe/otp,ahmedshafeeq/otp,NOMORECOFFEE/otp,paulcager/otp,sitexa/otp,riverrun/otp,cobusc/otp,dgud/otp,emacsmirror/erlang,RaimoNiskanen/otp,gjaldon/otp,bsmr-erlang/otp,matwey/otp,RoadRunnr/otp,erlang/otp,entropiae/otp,ferd/otp,jinshana/otp,jj1bdx/otp,bernardd/otp,cnbin/otp,lianghaivv/otp,legoscia/otp,psyeugenic/otp,dgud/otp,g-andrade/otp,kvakvs/otp,cnbin/otp,vic/otp,psyeugenic/otp,cobusc/otp,lucafavatella/otp,cnbin/otp,bsmr-erlang/otp,rlipscombe/otp,gjaldon/otp,marquisthunder/otp,dumbbell/otp,RichMorin/otp,lemenkov/otp,RoadRunnr/otp,awetzel/otp,legoscia/otp,mujiatong/otp,vinoski/otp,yangchengjian/otp,Teino1978-Corp/erlang-otp,ader1990/otp,GinjaNinja32/otp,hairyhum/otp,hairyhum/otp,schlagert/otp,Teino1978-Corp/otp,release-project/otp,theom/otp,RichMorin/otp,potatosalad/otp,Teino1978-Corp/erlang-otp,dgud/otp,c-rack/otp,mujiatong/otp,potatosalad/otp,neeraj9/otp,jinshana/otp,vladdu/otp,g-andrade/otp,uabboli/otp,emacsmirror/erlang,dumbbell/otp,palas/otp,saleyn/otp,rlipscombe/otp,dumbbell/otp,cobusc/otp,dumbbell/otp,goertzenator/otp,basho/otp,jamesruan/otp,ahmedshafeeq/otp,tuncer/otp,klarna/otp,krishnakumar4a4/otp,bugs-erlang-org/otp,ahmedshafeeq/otp,dumbbell/otp,basho/otp,klarna/otp,theom/otp,cnbin/otp,ferd/otp,jinshana/otp,bjorng/otp,fenollp/otp,neeraj9/otp,g-andrade/otp,lianghaivv/otp,rlipscombe/otp,mujiatong/otp,isvilen/otp,erlang/otp,mujiatong/otp,weisslj/otp,yangchengjian/otp,goertzenator/otp,jj1bdx/otp,sammoth-wazoku/otp,haguenau/otp,erlang/otp,bjorng/otp,lantti/otp,fenollp/otp,RoadRunnr/otp,GinjaNinja32/otp,stolen/otp,palas/otp,massemanet/otp,entropiae/otp,erlang/otp,msantos/otp,dgud/otp,paladim/otp,aboroska/otp,aboroska/otp,sammoth-wazoku/otp,haguenau/otp,mikpe/otp,VincentHHL/otp,jj1bdx/otp,rlipscombe/otp,fenollp/otp,emacsmirror/erlang,lrascao/otp,lrascao/otp,awetzel/otp,neeraj9/otp,aboroska/otp,riverrun/otp,gjaldon/otp,getong/otp,electricimp/otp,RJ/otp,legoscia/otp,erlang/otp,mujiatong/otp,matwey/otp,c-rack/otp,dumbbell/otp,uabboli/otp,c-rack/otp,bsmr-erlang/otp,entropiae/otp,lightcyphers/otp,sitexa/otp,jj1bdx/otp,lianghaivv/otp,emile/otp,electricimp/otp,emile/otp,lrascao/otp,derek121/otp,paladim/otp,yangchengjian/otp,lantti/otp,basho/otp,ader1990/otp,matwey/otp,vinoski/otp,VincentHHL/otp,erlang/otp,tuncer/otp,RJ/otp,vladdu/otp,derek121/otp,beni55/otp,ader1990/otp,VincentHHL/otp,tuncer/otp,lemenkov/otp,beni55/otp,hairyhum/otp,platinumthinker/otp,fenollp/otp,riverrun/otp,jamesruan/otp,paladim/otp,bugs-erlang-org/otp,bernardd/otp,electricimp/otp,paulcager/otp,mikpe/otp,weisslj/otp,RGafiyatullin/otp,yangchengjian/otp,basho/otp,sdebnath/otp,vinoski/otp,cobusc/otp,vladdu/otp,falkevik/otp,sammoth-wazoku/otp,release-project/otp,awetzel/otp,krishnakumar4a4/otp,awetzel/otp,isvilen/otp,potatosalad/otp,lhslll/otp,uabboli/otp,lemenkov/otp,aboroska/otp,jamesruan/otp,beni55/otp,legoscia/otp,platinumthinker/otp,getong/otp,jemsbhai/otp,marquisthunder/otp,neeraj9/otp,VincentHHL/otp,cobusc/otp,release-project/otp,awetzel/otp,lantti/otp,vladdu/otp,ahmedshafeeq/otp,palas/otp,electricimp/otp,emile/otp,jinshana/otp,kvakvs/otp,lightcyphers/otp,NOMORECOFFEE/otp,mikpe/otp,msantos/otp,platinumthinker/otp,VincentHHL/otp,potatosalad/otp,matwey/otp,vinoski/otp,weisslj/otp,bernardd/otp,RaimoNiskanen/otp,schlagert/otp,paulcager/otp,krishnakumar4a4/otp,dgud/otp,RichMorin/otp,emile/otp,electricimp/otp,neeraj9/otp,massemanet/otp,RJ/otp,sdebnath/otp,lemenkov/otp,enikki/otp,stolen/otp,bjorng/otp,g-andrade/otp,weisslj/otp,platinumthinker/otp,cnbin/otp,platinumthinker/otp,RGafiyatullin/otp,entropiae/otp,erlang/otp,awetzel/otp,lianghaivv/otp,fenollp/otp,riverrun/otp,fenollp/otp,paulcager/otp,palas/otp,lucafavatella/otp,goertzenator/otp,vinoski/otp,matwey/otp,GinjaNinja32/otp,getong/otp,palas/otp,emile/otp,uabboli/otp,ferd/otp,hairyhum/otp,lucafavatella/otp,benoitc/otp-1,riverrun/otp,benoitc/otp-1,tuncer/otp,RaimoNiskanen/otp,bsmr-erlang/otp,derek121/otp,potatosalad/otp,ader1990/otp,theom/otp,sdebnath/otp,mikpe/otp,isvilen/otp,lightcyphers/otp,emacsmirror/erlang,krishnakumar4a4/otp,dgud/otp,schlagert/otp,weisslj/otp,lianghaivv/otp,emacsmirror/erlang,Teino1978-Corp/erlang-otp,vinoski/otp,saleyn/otp,vladdu/otp,schlagert/otp,benoitc/otp-1,platinumthinker/otp,jamesruan/otp,johanclaesson/otp,klarna/otp,klarna/otp,matwey/otp,getong/otp,vic/otp,bjorng/otp,RoadRunnr/otp,kvakvs/otp,benoitc/otp-1,ahmedshafeeq/otp,bjorng/otp,johanclaesson/otp,sammoth-wazoku/otp,massemanet/otp,falkevik/otp,RichMorin/otp,sdebnath/otp,getong/otp,mujiatong/otp,gjaldon/otp,RaimoNiskanen/otp,bjorng/otp,enikki/otp,platinumthinker/otp,Teino1978-Corp/erlang-otp,jemsbhai/otp,kvakvs/otp,beni55/otp,tuncer/otp,getong/otp,theom/otp,jamesruan/otp,lantti/otp,gjaldon/otp,vinoski/otp,lrascao/otp,release-project/otp,derek121/otp,hairyhum/otp,rlipscombe/otp,stolen/otp,GinjaNinja32/otp,massemanet/otp,awetzel/otp,rlipscombe/otp,vic/otp,lrascao/otp,palas/otp,paulcager/otp,saleyn/otp,emacsmirror/erlang,uabboli/otp,jemsbhai/otp,RaimoNiskanen/otp,ferd/otp,theom/otp