Update legal.markdown

[craigcomstock]

mod_ssl doesn't have any public code URLs, inside the source it is indeed a BSD-style licence http://www.modssl.org/source/
from LICENSE in the latest tarball:

  LICENSE

  The mod_ssl package falls under the Open-Source Software label
  because it's distributed under a BSD-style license. The
  detailed license information follows.

  ====================================================================
  Copyright (c) 1998-2007 Ralf S. Engelschall. All rights reserved.

codeigniter I took the version we have from composer.json

            "name": "codeigniter/framework",
            "version": "3.1.13",
            "source": {
                "type": "git",
                "url": "https://github.com/bcit-ci/CodeIgniter.git",
                "reference": "bcb17eb8ba53a85de154439d0ab8ff1bed047bc9"
            },
            "dist": {
                "type": "zip",
                "url": "https://api.github.com/repos/bcit-ci/CodeIgniter/zipball/bcb17eb8ba53a85de154439d0ab8ff1bed047bc9",
                "reference": "bcb17eb8ba53a85de154439d0ab8ff1bed047bc9",
                "shasum": ""
            },

[craigcomstock]

reworked as #3164