python: fix documentation build with python 3.7

python: fix documentation build with python 3.7

The simplistic mocking in conf.py falls short on python 3.7. Just use
unittest.mock instead.

Fixes:

Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/sphinx/config.py", line 368, in eval_config_file
    execfile_(filename, namespace)
  File "/usr/lib/python3/dist-packages/sphinx/util/pycompat.py", line 150, in execfile_
    exec_(code, _globals)
  File "/path/to/notmuch/bindings/python/docs/source/conf.py", line 39, in <module>
    from notmuch import __VERSION__,__AUTHOR__
  File "/path/to/notmuch/bindings/python/notmuch/__init__.py", line 54, in <module>
    from .database import Database
  File "/path/to/notmuch/bindings/python/notmuch/database.py", line 25, in <module>
    from .globals import (
  File "/path/to/notmuch/bindings/python/notmuch/globals.py", line 48, in <module>
    class NotmuchDatabaseS(Structure):
TypeError: __mro_entries__ must return a tuple