manifest: just duplicate the definition of items as iteritems

Authored by durin42.

Description

manifest: just duplicate the definition of items as iteritems

The forwarding trick was failing test-check-interfaces on Python

  1. Duplicating a line of code is easy enough I'm doing that rather

than try and figure out what's going on in any kind of detail.

Differential Revision: https://phab.mercurial-scm.org/D3924

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