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rust: Update the memmap2 crate to version 0.4.0

This version:

* Optionally implements the `StableDeref` trait, removing the need
  for a wrapper type doing that
* Adds support for mapping empty files, which can routinely happen
  for dirstate-v2 data files. This was a cause of some failing tests
  when running with `run-tests.py --rhg --extra-config-opt rhg.status=1`

Differential Revision: https://phab.mercurial-scm.org/D11446

== New Features ==

 * `hg config` now has a `--source` option to show where each
   configuration value comes from.


== Default Format Change ==

These changes affects newly created repositories (or new clone) done with
Mercurial 5.8.


== New Experimental Features ==


== Bug Fixes ==


== Backwards Compatibility Changes ==


== Internal API Changes ==

The Dirstate API have been updated as the previous function leaked some
internal details and did not distinct between two important cases: "We are
changing parent and need to adjust the dirstate" and "some command is changing
which file is tracked". To clarify the situation:

* the following functions have been deprecated,

  - dirstate.add,
  - dirstate.normal,
  - dirstate.normallookup,
  - dirstate.merge,
  - dirstate.otherparent,
  - dirstate.remove,
  - dirstate.drop,

* these new functions are added for the "adjusting parents" use-case:

  - dirstate.update_file,
  - dirstate.update_file_p1,

* these new function are added for the "adjusting wc file" use-case":

  - dirstate.set_tracked,
  - dirstate.set_untracked,
  - dirstate.set_clean,
  - dirstate.set_possibly_dirty,

See inline documentation of the new functions for details.