fix: count files the collection lacks apart

The pack check failed a pack for a declared file nothing in the collection resolves to, though the builder cannot ship it and verify already reports it missing. Such destinations are now counted as not in the collection; a held file absent from the pack stays an error.

tests/test_pack_conformance_dirs.py

@@ -59,7 +59,7 @@ class ConformanceUsesTheRunDirectories(unittest.TestCase):
 
         def record(*args, **kwargs):
             seen.update(kwargs)
-            return True, 0, 0, [], 0, 0, 0, 0, 0
+            return True, 0, 0, [], 0, 0, 0, 0, 0, 0
 
         with mock.patch.object(gp, "list_registered_platforms", return_value=["fix"]), \
                 mock.patch.object(