Restore initDynLinker for older versions of ghc

It was probably important for something

Author: anka-213

ghcide/session-loader/Development/IDE/Session.hs

@@ -503,7 +503,10 @@ cradleToOptsAndLibDir cradle file = do
 emptyHscEnv :: IORef NameCache -> FilePath -> IO HscEnv
 emptyHscEnv nc libDir = do
     env <- runGhc (Just libDir) getSession
-    -- initDynLinker env -- This causes ghc9 to crash
+#if !MIN_GHC_API_VERSION(9,0,0)
+    -- This causes ghc9 to crash
+    initDynLinker env
+#endif
     pure $ setNameCache nc env{ hsc_dflags = (hsc_dflags env){useUnicode = True } }
 
 data TargetDetails = TargetDetails