And don't use the old flag with new cabals
And don't use the old flag with new cabals

We generate both --constraint and --dependency flags, but we only need
to pass one or the other, depending on the Cabal version.

gbaz/cabal,ghc-android/cabal,typelead/epm,mightybyte/cabal,anton-dessiatov/cabal,gridaphobe/cabal,eric-stanley/cabal,bennofs/cabal,Peaker/cabal,ghc-android/cabal,thoughtpolice/cabal,mmakowski/cabal,randen/cabal,enolan/cabal,ian-ross/cabal,lukexi/cabal,mmakowski/cabal,x-y-z/cabal,beni55/cabal,eric-stanley/cabal,kolmodin/cabal,lukexi/cabal,trskop/cabal,thomie/cabal,kosmikus/cabal,fpco/cabal,plow-technologies/cabal,typelead/epm,beni55/cabal,triplepointfive/cabal,kolmodin/cabal,sopvop/cabal,edsko/cabal,seereason/cabal,gbaz/cabal,corngood/cabal,themoritz/cabal,garetxe/cabal,themoritz/cabal,kosmikus/cabal,mydaum/cabal,headprogrammingczar/cabal,randen/cabal,trskop/cabal,rimmington/cabal,Helkafen/cabal,fpco/cabal,martinvlk/cabal,valderman/cabal,mydaum/cabal,plumlife/cabal,triplepointfive/cabal,sopvop/cabal,valderman/cabal,edsko/cabal,gridaphobe/cabal,Helkafen/cabal,thoughtpolice/cabal,fugyk/cabal,christiaanb/cabal,martinvlk/cabal,Heather/cabal,themoritz/cabal,corngood/cabal,rimmington/cabal,Heather/cabal,Peaker/cabal,thomie/cabal,plow-technologies/cabal,headprogrammingczar/cabal,seereason/cabal,ian-ross/cabal,x-y-z/cabal,bennofs/cabal,plumlife/cabal,anton-dessiatov/cabal,sopvop/cabal,christiaanb/cabal,garetxe/cabal,enolan/cabal,fugyk/cabal,mightybyte/cabal