Fix #5639 Backport efficient ghc-pkg unregister

Author: mpilgrem

.hlint.yaml

@@ -73,6 +73,7 @@
   # Stack's code generally avoids the use of C preprocessor (CPP) directives.
   - name: CPP
     within:
+    - GHC.Utils.GhcPkg.Main.Compat
     - Stack.BuildInfo
     - Stack.Constants
   # The following list provides an inventory of the small number of modules
@@ -90,6 +91,14 @@
     name:
     - CPP
     - PackageImports
+  # GHC.Utils.GhcPkg.Main.Compat's code largely comes from the GHC repository.
+  - within: GHC.Utils.GhcPkg.Main.Compat
+    name:
+    - FlexibleInstances
+    - KindSignatures
+    - MultiParamTypeClasses
+    - ScopedTypeVariables
+    - TupleSections
 
 # Not considered useful hints
 - ignore:

package.yaml

@@ -82,6 +82,7 @@ dependencies:
 - filepath
 - fsnotify >= 0.4.1
 - generic-deriving
+- ghc-boot
 - hi-file-parser >= 0.1.4.0
 - hpack >= 0.35.3
 - hpc