erlexec: Make ERL_<version>_FLAGS behave like ERL_AFLAGS
erlexec: Make ERL_<version>_FLAGS behave like ERL_AFLAGS

The contents of the ERL_<version>_FLAGS undocumented environment
variable would be added at the end of the command line passed
to the BEAM emualator (similar to ERL_ZFLAGS), making it impossible
to override (for example) "-smp" with "-smp disable" on the command
line.

To allow overriding, put the contents of ERL_<version>_FLAGS at
the beginning of the command line (similar to ERL_AFLAGS).

Since the ERL_<version>_FLAGS variable is undocumented and
unsupported, it is OK to change its behaviour in a minor release.

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