New issue 2930: memoryview(ctypes.Structure) does not produce the correct
format string
https://bitbucket.org/pypy/pypy/issues/2930/memoryview-ctypesstructure-does-not
mattip:
The following passes on CPython, fails on PyPy (`mv.format` is `B`)
```
class Struct(Structure):
_fields_ = [('a', c_int16)]
Struct3 = 3 * Struct
c_array = (2 * Struct3)(
Struct3(Struct(a=1), Struct(a=2), Struct(a=3)),
Struct3(Struct(a=4), Struct(a=5), Struct(a=6))
)
mv = memoryview(c_array)
assert mv.format == 'T{<h:a:}'
```
The `memoryview` call goes to `_CData.__buffer__` in
`lib_pypy._ctypes.basics.py`, which should not just call `buffer(self._buffer)`
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