install-ansible: Pre-install build deps for aarch64

Because there's no wheels for aarch64, ensure the build dependencies
are installed.

Change-Id: I9a708cbedd4f0dd471ebbd758f7cbe82be7e47c4

playbooks/roles/install-ansible/tasks/main.yaml

@@ -19,6 +19,15 @@
     _install_ansible_state: latest
   when: install_ansible_version == 'latest'
 
+- name: Ensure required build packages for non-wheel architectures
+  apt:
+    update_cache: yes
+    name:
+      - libffi-dev
+      - libssl-dev
+      - build-essential
+  when: ansible_architecture == 'aarch64'
+
 - name: Install ansible
   pip:
     name: '{{ install_ansible_name | default("ansible") }}'