Adafruit-blinka

Also add a check for windows to not install sysv

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux) for info on how to use it.

Defaults to the names we have for the pins. Fix allows for use of `board.I2C` and `board.SPI` from specific drivers and helper libraries.

Thanks to ladyada for adding this!

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux) for info on how to use it.

Thanks to cpforbes for the fix! :)

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux) for info on how to use it.

We now have support for various Tegra chips and boards

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux) for info on how to use it.

Thanks to gbrown128 https://github.com/adafruit/Adafruit_Blinka/pull/85

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux) for info on how to use it.

(re-release with incremented number)
We now use the i2c port 0 on the very first raspi's

To use in CPython, `pip3 install adafruit-blinka`.

Read the [docs](https://learn.adafruit.com/circuitpython-on-raspberrypi-linux) for info on how to use it.