treewide: Fix up stripDebugList attrs to be lists.

The documentation says this should be a list, and it already is in
about half the expressions that set it.

The difference doesn't matter at present, because these values are all
space-free literals.  But it will in a future with __structuredAttrs .

(The similar attr stripAllList has no users in the nixpkgs tree, so
there's nothing to do to fix any of those up.)

pkgs/development/libraries/ldb/default.nix

@@ -52,7 +52,7 @@ stdenv.mkDerivation rec {
     "--without-ldb-lmdb"
   ];
 
-  stripDebugList = "bin lib modules";
+  stripDebugList = [ "bin" "lib" "modules" ];
 
   meta = with stdenv.lib; {
     description = "A LDAP-like embedded database";