Reenable GHC environment file support

This was temporarily disabled via
3033776 due to haskell#4010
but it turns out that we can easily workaround this for
older Cabal versions.

All we need to do is inject `--ghc-options=-hide-all-packages` into
the flags passed to Setup.hs when an old `Cabal` version is detected
(this was suggested by @dcoutts in
haskell#4010 (comment))

Luckily, `-hide-all-packages` is idempotent in GHC, so we can place it
anywhere on the GHC command-line as well as multiple times with the
same result.

This would close haskell#4010

(cherry picked from commit 6fc90eb34259170aa4949d2d127c942899f3351e)

cabal-install/Distribution/Client/ProjectPlanOutput.hs

@@ -673,8 +673,6 @@ writePlanGhcEnvironment DistDirLayout{distProjectRootDirectory}
   | compilerFlavor compiler == GHC
   , supportsPkgEnvFiles (getImplInfo compiler)
   --TODO: check ghcjs compat
-  --TODO: This feature is temporarily disabled due to #4010
-  , False
   = writeGhcEnvironmentFile
       distProjectRootDirectory
       platform (compilerVersion compiler)

cabal-install/Distribution/Client/ProjectPlanning.hs

@@ -2980,7 +2980,13 @@ setupHsConfigureFlags (ReadyPackage elab@ElaboratedConfiguredPackage{..})
                                   ElabComponent _ -> toFlag elabComponentId
 
     configProgramPaths        = Map.toList elabProgramPaths
-    configProgramArgs         = Map.toList elabProgramArgs
+    configProgramArgs
+        | elabSetupScriptCliVersion < mkVersion [1,24,2]
+          -- workaround for https://github.com/haskell/cabal/issues/4010
+                              = Map.toList $
+                                Map.insertWith (++) "ghc" ["-hide-all-packages"]
+                                               elabProgramArgs
+        | otherwise           = Map.toList elabProgramArgs
     configProgramPathExtra    = toNubList elabProgramPathExtra
     configHcFlavor            = toFlag (compilerFlavor pkgConfigCompiler)
     configHcPath              = mempty -- we use configProgramPaths instead