[erlang-patches] remove deprecated driver_async_cancel function

[Steve Vinoski]

The driver_async_cancel function has been deprecated for some time, with
the current documentation indicating that it's slated for removal in R17.
This patch removes the function and associated tests and docs, increments
the driver interface version to 3.0, and fixes the driver test suite to
handle 3.0 properly where needed.

https://github.com/erlang/otp/pull/194

--steve
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