win32mbcs: util.normpath should be wrapped.
It is because util.normpath() finally calls windows.pconvert()
which is not wrapped (by changeset:
25c41ddb3978).
#!/bin/sh
hg init repo
cd repo
touch foo
hg ci -Am 'add foo'
hg up -C null
# this should be stored as a delta against rev 0
echo foo bar baz > foo
hg ci -Am 'add foo again'
hg debugindex .hg/store/data/foo.i