If you run ``import array; int(buffer(array.array('c')))`` the
interpreter will segfault. While investigating this I discovered that
buffer objects, for their tp_as_buffer->bf_getcharbuffer, return the
result by calling the wrapped object bf_getreadbuffer or
bf_getwritebuffer. This is wrong since it is essentially redirecting
the expected call to the wrong tp_as_buffer slot for the wrapped
object. Plus it doesn't have Py_TPFLAGS_HAVE_GETCHARBUFFER defined.
I see two options here. One is to remove the bf_getcharbuffer slot
from the buffer object. The other option is to fix it so that it only
returns bf_getcharbuffer and doesn't redirect improperly (this also
brings up the issue if Py_TPFLAGS_HAVE_GETCHARBUFFER should then also
be defined for buffer objects).
Since I don't use buffer objects I don't know if it is better to fix
this or just rip it out.
-Brett
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