WIP!

Motivation for this change

On PHP Startup you got following warnings:

[cb,WARN] (pcbc/ext L:418) igbinary serializer is not found
[cb,WARN] (pcbc/ext L:425) zlib compressor is not found

I want to remove these,

Things done

I've added the igbinary package and add igbinary and zlib as buildInputs.
With these changes, I get the following warning:

PHP Warning:  PHP Startup: Unable to load dynamic library '/nix/store/ssib4rawawan5h3wc2h8r9mc56q0gy66-php-couchbase-2.3.4/lib/php/extensions/couchbase.so' - /nix/store/ssib4rawawan5h3wc2h8r9mc56q0gy66-php-couchbase-2.3.4/lib/php/extensions/couchbase.so: undefined symbol: igbinary_unserialize in Unknown on line 0

I really don't know how to fix this, so I thought a PR would be the best place to get good help on this. I have been googling and testing around a week now and don't have any ideas how to fix this.
Maybe anyone could help me out :)

• Tested using sandboxing (nix.useSandbox on NixOS, or option build-use-sandbox in nix.conf on non-NixOS)
• Built on platform(s)
  • NixOS
  • macOS
  • other Linux distributions
• Tested via one or more NixOS test(s) if existing and applicable for the change (look inside nixos/tests)
• Tested compilation of all pkgs that depend on this change using nix-shell -p nox --run "nox-review wip"
• Tested execution of all binary files (usually in ./result/bin/)
• Fits CONTRIBUTING.md.