Monitor also ghc.shim file on Windows

Author: jasagredo

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

@@ -988,7 +988,10 @@ programsMonitorFiles progdb =
   , monitor <-
       monitorFileSearchPath
         (programMonitorFiles prog)
-        (programPath prog)
+        (programPath prog) ++
+        if programId prog == "ghc" && buildOS == Windows
+        then [monitorFile $ programPath prog -<.> "shim"]
+        else []
   ]
 
 -- | Select the bits of a 'ProgramDb' to monitor for value changes.