Remove redundant Subst hi-boot files
+++ /dev/null
-_interface_ Subst 2
-_exports_ Subst Subst substTyWith ;
-_declarations_
-1 data Subst;
-1 substTyWith _:_ [Var.TyVar] -> [TypeRep.Type] -> TypeRep.Type -> TypeRep.Type ;;
-
+++ /dev/null
-__interface Subst 2 0 where
-__export Subst Subst substTyWith ;
-1 data Subst;
-1 substTyWith :: [Var.TyVar] -> [TypeRep.Type] -> TypeRep.Type -> TypeRep.Type ;
-
+++ /dev/null
-module Subst where
-
-data Subst
-substTyWith :: [Var.TyVar] -> [TypeRep.Type] -> TypeRep.Type -> TypeRep.Type