Custom SSL verification callbacks should now work

Phew, this turned out to be more complicated than I originally thought.
Anyway, now you should be able to set a custom SSL verification callback
with

def verify_cb(ok, store):
    # Do my custom verification
    return ok

ctx = SSL.Context()
ctx.set_verify(SSL.verify_peer | SSL.verify_fail_if_no_peer_cert, 9,
verify_cb)

Previously that crashed on me every time. Both the new style callback
and the old style callback with 5 arguments are supported, and
everything should be backwards compatible. The 5 argument version is
deprecated.

I would be interested to hear if:

1) You experience any problems with this
2) You were actually using the custom callback successfully before

--
  Heikki Toivonen

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