Arch Linux

Description: After the installation of squid, `squid -k parse` fails with this error:

```
squid: error while loading shared libraries: libnettle.so.7: cannot open shared object file: No such file or directory
```

Additional info:
* package version(s): squid-4.7-2-x86_64
* config and/or log files etc.
* link to upstream bug report, if any

Steps to reproduce:
```
docker run -ti archlinux/base /bin/bash
[root@ec54f6443381 /]# pacman -Sy squid
:: Synchronizing package databases...
core 133.7 KiB 1285K/s 00:00 [######################] 100%
extra 1633.3 KiB 4.07M/s 00:00 [######################] 100%
community 4.9 MiB 8.04M/s 00:01 [######################] 100%
resolving dependencies...
looking for conflicting packages...

Packages (4) libnsl-1.2.0-1 libtool-2.4.6+42+gb88cebd5-4 tar-1.32-1
squid-4.7-2

Total Download Size: 4.00 MiB
Total Installed Size: 16.32 MiB

:: Proceed with installation? [Y/n] y
:: Retrieving packages...
tar-1.32-1-x86_64 743.7 KiB 3.46M/s 00:00 [######################] 100%
libtool-2.4.6+42+gb... 399.5 KiB 2.36M/s 00:00 [######################] 100%
libnsl-1.2.0-1-x86_64 57.3 KiB 1082K/s 00:00 [######################] 100%
squid-4.7-2-x86_64 2.8 MiB 6.05M/s 00:00 [######################] 100%
(4/4) checking keys in keyring [######################] 100%
(4/4) checking package integrity [######################] 100%
(4/4) loading package files [######################] 100%
(4/4) checking for file conflicts [######################] 100%
(4/4) checking available disk space [######################] 100%
:: Processing package changes...
(1/4) installing tar [######################] 100%
(2/4) installing libtool [######################] 100%
(3/4) installing libnsl [######################] 100%
(4/4) installing squid [######################] 100%
:: Running post-transaction hooks...
(1/5) Cleaning up package cache...
(2/5) Reloading system manager configuration...
Skipped: Current root is not booted.
(3/5) Creating system user accounts...
Creating group proxy with gid 15.
Creating user proxy (n/a) with uid 15 and gid 15.
(4/5) Creating temporary files...
[/usr/lib/tmpfiles.d/journal-nocow.conf:26] Failed to resolve specifier: uninitialized /etc detected, skipping
All rules containing unresolvable specifiers will be skipped.
(5/5) Arming ConditionNeedsUpdate...
[root@ec54f6443381 /]# squid -k parse
squid: error while loading shared libraries: libnettle.so.7: cannot open shared object file: No such file or directory
```