repair: build dirlogs using manifest, rather than repo shortcut method

As before, this was rarely used, so let's get rid of the convenience method.

mercurial/repair.py

@@ -173,7 +173,7 b' def strip(ui, repo, nodelist, backup=Tru'
                     if (unencoded.startswith('meta/') and
                         unencoded.endswith('00manifest.i')):
                         dir = unencoded[5:-12]
-                        repo.dirlog(dir).strip(striprev, tr)
+                        repo.manifest.dirlog(dir).strip(striprev, tr)
             for fn in files:
                 repo.file(fn).strip(striprev, tr)
             tr.endgroup()