Merge pull request #10948 from haskell/make-flag-a-synonym-for-last

Cabal-QuickCheck/src/Test/QuickCheck/Instances/Cabal.hs

Cabal-syntax/src/Distribution/Utils/Structured.hs

Cabal-tests/tests/UnitTests/Distribution/Utils/Structured.hs

Cabal-tree-diff/src/Data/TreeDiff/Instances/Cabal.hs

Cabal/src/Distribution/Backpack/Id.hs

Cabal/src/Distribution/Simple/Flag.hs

Cabal/src/Distribution/Simple/GHC/Internal.hs

Cabal/src/Distribution/Simple/Setup.hs

Cabal/src/Distribution/Simple/Setup/Common.hs

cabal-install/src/Distribution/Client/CmdBuild.hs

cabal-install/src/Distribution/Client/CmdClean.hs

cabal-install/src/Distribution/Client/CmdFreeze.hs

cabal-install/src/Distribution/Client/CmdHaddock.hs

cabal-install/src/Distribution/Client/CmdHaddockProject.hs

cabal-install/src/Distribution/Client/CmdInstall.hs

.../src/Distribution/Client/CmdInstall/ClientInstallFlags.hs

cabal-install/src/Distribution/Client/CmdOutdated.hs

cabal-install/src/Distribution/Client/CmdPath.hs

cabal-install/src/Distribution/Client/CmdRepl.hs

cabal-install/src/Distribution/Client/CmdSdist.hs