Drop Distribution.Client.Compat.ExecutablePath

Every supported base has getExecutablePath in System.Environment now.

Author: sthibaul

cabal-install/cabal-install.cabal

@@ -128,7 +128,6 @@ library
         Distribution.Client.CmdUpdate
         Distribution.Client.CmdGenBounds
         Distribution.Client.Compat.Directory
-        Distribution.Client.Compat.ExecutablePath
         Distribution.Client.Compat.Orphans
         Distribution.Client.Compat.Prelude
         Distribution.Client.Compat.Semaphore

cabal-install/src/Distribution/Client/Compat/ExecutablePath.hs

@@ -179,7 +179,7 @@ import Distribution.Verbosity
 
 import Data.List (foldl1')
 import qualified Data.Map.Lazy as Map
-import Distribution.Client.Compat.ExecutablePath (getExecutablePath)
+import System.Environment (getExecutablePath)
 import Distribution.Compat.Process (proc)
 import System.Directory (doesFileExist)
 import System.FilePath ((<.>), (</>))