python3Packages.mypy: compile with mypyc

Mypy includes mypyc, a compiler that translates annotated Python to C,
which can be compiled into a Python module. When mypy is compiled with
mypyc, it is about 4 times faster than the interpreted mypy, so using
the compiled version is especially useful on large codebases where
typechecking may take a long time.

The wheels distributed on Pypi have included a mypyc-compiled mypy by
default since version 0.700 [1].

[1]: http://mypy-lang.blogspot.com/2019/04/mypy-0700-released-up-to-4x-faster.html

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