tweak script used to build candidate ghcide in benchmarks

The goal is to convince Cabal to apply the ghc options only to the ghcide binary
and not to all the dependencies, which causes massive rebuilds and leads to
benchmarks timeouts

Author: pepeiborra

ghcide/bench/hist/Main.hs

@@ -140,14 +140,15 @@ type instance RuleResult GetSamples = Natural
 
 buildGhcide :: BuildSystem -> [CmdOption] -> FilePath -> Action ()
 buildGhcide Cabal args out = do
+    liftIO $ writeFile "cabal.project.local" $ unlines
+      [ "package ghcide"
+      , "  ghc-options: -eventlog -rtsopts"]
     command_ args "cabal"
         ["install"
         ,"exe:ghcide"
         ,"--installdir=" ++ out
         ,"--install-method=copy"
         ,"--overwrite-policy=always"
-        ,"--ghc-options=-rtsopts"
-        ,"--ghc-options=-eventlog"
         ]
 
 buildGhcide Stack args out =