Is it possible to link to python-dbg?

```
INFO: PyCall is using /usr/bin/python-dbg (Python 2.7.9) at /usr/bin/python-dbg, libpython = libpython2.7_d
```

And `Segmentation Fault` as soon as `using PyCall`.

```
_PyType_Lookup at /usr/bin/../lib/x86_64-linux-gnu/libpython2.7_d.so (unknown line)
unknown function (ip: 0x7fd8d39f4b39)
unknown function (ip: 0x7fd8d39f4bda)
unknown function (ip: 0x7fd8d39f63f7)
PyType_Ready at /usr/bin/../lib/x86_64-linux-gnu/libpython2.7_d.so (unknown line)
```

Start by reproducing `using PyCall` with `/usr/bin/python-dbg` as shown in the issue, then inspect the reported `_PyType_Lookup` and `PyType_Ready` frames. Done should establish whether PyCall can link to this debug Python build and record the resulting support status or limitation.

Rédigé par le modèle d'indexation à partir du texte de l'issue.