apache2-ssl (2.4.33-r0) post install fails (Alpine 3.6 + 3.7)
The package apache2-ssl-2.4.33-r0.post-install fails on Alpine 3.6 and 3.7.
To reproduce:
```
docker run —rm -ti alpine:3.6 /bin/sh
/ # apk update
fetch
http://dl-cdn.alpinelinux.org/alpine/v3.6/main/x86\_64/APKINDEX.tar.gz
fetch
http://dl-cdn.alpinelinux.org/alpine/v3.6/community/x86\_64/APKINDEX.tar.gz
v3.6.2-317-g2ee6af55
[http://dl-cdn.alpinelinux.org/alpine/v3.6/main\]
v3.6.2-305-gbd91af38
[http://dl-cdn.alpinelinux.org/alpine/v3.6/community\]
OK: 8440 distinct packages available
/ # apk add apache2-ssl
(1/9) Installing libuuid (2.28.2-r2)
(2/9) Installing apr (1.5.2-r1)
(3/9) Installing expat (2.2.0-r1)
(4/9) Installing apr-util (1.5.4-r3)
(5/9) Installing pcre (8.41-r0)
(6/9) Installing apache2 (2.4.33-r0)
Executing apache2-2.4.33-r0.pre-install
(7/9) Installing libressl2.5-libtls (2.5.5-r1)
(8/9) Installing libressl (2.5.5-r1)
(9/9) Installing apache2-ssl (2.4.33-r0)
Executing apache2-ssl-2.4.33-r0.post-install
ERROR: apache2-ssl-2.4.33-r0.post-install: script exited with error
127
Executing busybox-1.26.2-r9.trigger
1 error; 8 MiB in 20 packages
```
(from redmine: issue id 8938, created on 2018-05-29, closed on 2018-09-11)