Restore support for brltty (#15658)
Fixes #15652
See also nvaccess/nvda-misc-deps#28
Summary of the issue:
BRLTTY support was temporarily acknowledged as broken as part of #15544.
Description of user facing changes
None
Description of development approach
Update misc deps
Re-enable the brlapi test
Testing strategy:
Execute scons dist and run the generated NVDA distribution. Execute import brlapi from the Python Console.
