PPA doesn't include all dependencies for providers (clipboard/spelling/...)

[dolang]

The PPA kivy-daily doesn't include some providers in its dependencies (and of course, the stable PPA isn't up-to-date anyhow).

Clipboard:

• python-gi (gtk3)
• klipper (dbusklipper)
• SDL2 (sdl2)

Spelling:

• pyenchant (enchant)

There are probably some others that should be included in one way or another. kivy/__init__.py has a list of all supported providers, although some are platform-specific.