[Debian-med-packaging] Bug#927387: invesalius: crashes after splash screen

[David Paul]

> What is the content of the folder /usr/lib/invesalius/invesalius_cy/ ?

```
$ ls -AlF /usr/lib/invesalius/invesalius_cy/
total 1380
-rw-r--r-- 1 root root 246352 Sep 12  2018 cy_mesh.cpython-36m-x86_64-linux-gnu.so
-rw-r--r-- 1 root root 339928 Sep 12  2018 floodfill.cpython-36m-x86_64-linux-gnu.so
-rw-r--r-- 1 root root      0 Sep 12  2018 __init__.py
-rw-r--r-- 1 root root 370080 Sep 12  2018 interpolation.cpython-36m-x86_64-linux-gnu.so
-rw-r--r-- 1 root root 200128 Sep 12  2018 mips.cpython-36m-x86_64-linux-gnu.so
-rw-r--r-- 1 root root 247424 Sep 12  2018 transforms.cpython-36m-x86_64-linux-gnu.so
```