Found a couple of failing tests on Alpine Linux and OpenBSD. For the
tests to even run `ip4-localhost` has to be changed to an IP-address
(127.0.0.1). `ip4-localhost` is typically not part of `/etc/hosts`.
Output failing tests:
```
not ok 5
udp: 0
prefix: tls:
listen [1]:
host: localhost
port: 9025
flushing deferred data to fd 9
selecting... max_fd=11 num_probing=0
activity on fd8
closing fd 8
closing fd 9
selecting... max_fd=11 num_probing=0
# Failed test at ./t line 59.
# got: '1'
# expected: 'sslh-select: Connect and write nothing'
```
```
not ok 22 - sslh-select:ssh: probe connected correctly
# Failed test 'sslh-select:ssh: probe connected correctly'
# at ./t line 59.
# got: 'regex'
# expected: 'ssh'
```
```
not ok 68 - sslh-select:ssh: probe connected correctly
# Failed test 'sslh-select:ssh: probe connected correctly'
# at ./t line 59.
# got: 'regex'
# expected: 'ssh'
```
Diff works around issues causing tests 22 and 68 to fail. As of yet, no
workaround for test 5 has been found.
