lib/berkeley-db-1.xx: Update submodule URL and version.

This updates the berkeley-db-1.xx submodule URL to a repository hosted
under the micropython organisation, and makes the following changes:

- Moves the berkeley-db header files to a single directory within the
  submodule, and references all these headers with a much fuller path,
  which prevents symbol clashes (eg with esp32 and queue.h).

- Removes unused/non-working files from berkeley-db, which removes all
  symlinks in that repo (symlinks don't play well under Windows).

- Allows injecting an external configuration header into berkeley-db, so
  the configuration doesn't have to be provided by -Dxx=yy flags to the
  compiler (and possibly clashing with other symbols).

- Removes the advertising clause from the BSD 4-clause license of
  berkeley-db (see relevant commit and README.Impt.License.Change for
  details).

Signed-off-by: Damien George <damien@micropython.org>

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