Use both ghc and ghc-lib

Author: jneira

Diff for: haskell-language-server.cabal

@@ -145,13 +145,17 @@ library hlint-plugin
     , unordered-containers
   if !flag(ghc-lib) && impl(ghc >= 8.10.1) && impl(ghc < 8.11.0)
     build-depends:
-      ghc == 8.10.*
+        ghc == 8.10.*
   else
     build-depends:
-      ghc-lib == 8.10.*
+        ghc
+      , ghc-lib == 8.10.*
+      , ghc-lib-parser-ex == 8.10.*
     cpp-options:
-      -DGHC_LIB
-
+        -DGHC_LIB
+    mixins:
+        ghc (GHC as RealGHC, HscTypes as RealGHC.HscTypes, EnumSet as RealGHC.EnumSet) 
+        
   ghc-options:
          -Wall
          -Wredundant-constraints