Create an ansible task for downloading icu

[jbergstroem]

This should be run for all release machines.

refs: #190

[joaocgreis]

This is already included for the Windows machines: https://github.com/janeasystems/build/blob/aded718cdd1b826d0dfe508cc47b8d20a09df58e/setup/windows/ansible-playbook.yaml#L69-L88

[jbergstroem]

Here's a slightly improved version I have as part of my "ansible 2.0 refactor":

Edit: updated with 57.1.

---
# Downloads ICU and verifies checksums
# @requires dest=/tmp

- name: Download ICU
  get_url:
    - url: https://ssl.icu-project.org/files/icu4c/{{ item.version }}/icu4c-{{ item.version|replace('.','_') }}-src.tgz
    - dest: {{ dest }}
    - checksum: md5:{{ item.md5 }}
  with_items:
    - { version: '54.1', md5: 'e844caed8f2ca24c088505b0d6271bc0' }
    - { version: '55.1', md5: 'e2d523df79d6cb7855c2fbe284f4db29' }
    - { version: '56.1', md5: 'c4a2d71ff56aec5ebfab2a3f059be99d' }
    - { version: '57.1', md5: 'f797503ecaebf1d38920013dc7893066' }

[Trott]

Is this still an issue? Should it remain open?

[richardlau]

I don't believe this is an issue ever since Node.js started bundling and compiling against a stripped down ICU (icu-small, nodejs/node#6088). Now that Node.js v4.x is EOL I believe all LTS and current releases build this way and do not require an external ICU.