Submit/php fpm

Belongs to: https://github.com/NixOS/nixos/pull/153

 purpose:
      PHP: fpm support (including patches for systemd socket activation)
      nixos systemd unit implementation
      keep old PHP-5.2 working even though its horrible outdated.
    
    keep everything in one file, because most code is the same, eg the code to build
    extensions (apc, xdebug, ..)

This includes the multiple-versions-in-one-file patch which can be dropped if somebody tests apc and verifies that the new version (which hasn't been updated either) works.

See https://github.com/NixOS/nixpkgs/pull/310