Segmentation fault

[Daniel]

Whenever I try to start one of the newer versions of slirp, it fails with a Segmentation fault almost immediately after start:

```
$ slirp 'redir 8888 8888'

Slirp v1.0.17 (BETA)

Copyright (c) 1995,1996 Danny Gasparovski and others.
All rights reserved.
This program is copyrighted, free software.
Please read the file COPYRIGHT that came with the Slirp
package for the terms and conditions of the copyright.

Redirection failed: Permission denied
Redirection failed: Permission denied
IP address of Slirp host: 127.0.1.1
IP address of your DNS(s): 192.168.1.223, 127.0.0.53
Your address is 10.0.2.15
(or anything else you want)

Type five zeroes (0) to exit.

[autodetect SLIP/CSLIP, MTU 1500, MRU 1500, 115200 baud]

SLiRP Ready ...
Segmentation fault (core dumped)
```

I tried all available versions, found on packages.ubuntu.com:

slirp_1.0.17-8_amd64.deb xenial works
slirp_1.0.17-8build1_amd64.deb disco,cismic,bionic Segfault
slirp_1.0.17-8build2_amd64.deb eoan Segfault

The Segfault happens no matter if I start it on command line with or without arguments or if I start it through UML (User-mode linux).
Test systems were:
- ubuntu:latest docker image
- a real host with Ubuntu 18.04.3

Now, I'm using the deb from http://de.archive.ubuntu.com/ubuntu/pool/universe/s/slirp/slirp_1.0.17-8_amd64.deb and everything seems to work.