New issue 2653: __import__ cannot be overwritten in exec
https://bitbucket.org/pypy/pypy/issues/2653/__import__-cannot-be-overwritten-in-exec
Michael Howitz:
Given the following code:
```python
code = compile('import os', '<string>', 'exec')
glb = {'__builtins__': {'__import__': lambda *a: 42}}
exec(code, glb)
print(glb['os'])
```
PyPy behaves differently from CPython:
* Python 2.7.13 prints `42`
* Python 3.6.2 prints `42`
* PyPy 5.8.0 prints `<module 'os' from
'/opt/local/lib/pypy/lib-python/2.7/os.py'>`
* PyPy3 5.5.0 prints `<module 'os' from
'/Users/mac/python/pypy3-v5.5.0-osx64/lib-python/3/os.py'>`
This prevents using a custom `__import__` function.
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