Re-add zip library for php 7.3

[eiriksm]

So, here is a weird bug.

On php 7.3 it seems we have to add libzip-dev twice to get the extension to work.

Steps to reproduce:

$ docker run -it --rm drupaldocker/php:7.3-cli-2.x composer --version
PHP Warning:  PHP Startup: Unable to load dynamic library 'zip.so' (tried: /usr/local/lib/php/extensions/no-debug-non-zts-20180731/zip.so (Error loading shared library libzip.so.5: No such file or directory (needed by /usr/local/lib/php/extensions/no-debug-non-zts-20180731/zip.so)), /usr/local/lib/php/extensions/no-debug-non-zts-20180731/zip.so.so (Error loading shared library /usr/local/lib/php/extensions/no-debug-non-zts-20180731/zip.so.so: No such file or directory)) in Unknown on line 0
Do not run Composer as root/super user! See https://getcomposer.org/root for details
Composer version 1.8.0 2018-12-03 10:31:16

Test for fix:

$ docker run -it --rm drupaldocker/php:7.3-cli-2.x /bin/sh
/var/www/html # apk add libzip-dev && composer --version
fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/main/x86_64/APKINDEX.tar.gz
fetch http://dl-cdn.alpinelinux.org/alpine/v3.8/community/x86_64/APKINDEX.tar.gz
(1/4) Installing pkgconf (1.5.3-r0)
(2/4) Installing zlib-dev (1.2.11-r1)
(3/4) Installing libzip (1.5.1-r1)
(4/4) Installing libzip-dev (1.5.1-r1)
Executing busybox-1.28.4-r1.trigger
OK: 70 MiB in 58 packages
Do not run Composer as root/super user! See https://getcomposer.org/root for details
Composer version 1.8.0 2018-12-03 10:31:16

Anyway. This does not occur on 7.2 (or other versions):

$ docker run -it --rm drupaldocker/php:7.2-cli-2.x composer --version
Do not run Composer as root/super user! See https://getcomposer.org/root for details
Composer version 1.8.0 2018-12-03 10:31:16

With the attached fix, the error no longer occurs for me.

Edited to clarify the part with the tested fix, where I ran a wrong command 😬