Build irserver on the device on a 64-bit or trixie userland

The shipped irserver is a 32-bit ARM binary linked against libzip.so.4, which only
exists on armhf with Debian 12 or older. On a 64-bit userland or trixie it cannot run,
so the role now compiles the bundled 2019 sources on the device there, with GCC 14's
new hard errors (implicit declarations, implicit int, pointer/int mix-ups) downgraded
rather than the old code patched. Picked from `dpkg --print-architecture` and the
distribution version; `pi_irserver_build_from_source: true|false` forces it.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

roles/pi_irserver/tasks/main.yml

@@ -1,10 +1,27 @@
 ---
-- name: Copy irserver
+- name: Get the userland architecture
+  # See pi_squeezelite_custom: the kernel's architecture is not the userland's.
+  ansible.builtin.command: dpkg --print-architecture
+  register: pi_irserver_dpkg_arch
+  changed_when: false
+  check_mode: false # read-only
+- name: Decide between the prebuilt binary and a build on the device
+  ansible.builtin.set_fact:
+    pi_irserver_build: >-
+      {{ (pi_irserver_build_from_source | string | lower == 'true')
+         or (pi_irserver_build_from_source | string | lower == 'auto'
+             and (pi_irserver_dpkg_arch.stdout | trim != 'armhf'
+                  or ansible_facts.distribution_major_version | int >= 13)) }}
+- name: Copy prebuilt irserver (32-bit ARM binary)
   ansible.builtin.copy:
     src: irserver
     dest: /usr/bin/irserver
     mode: u+rx
   notify: Restart irserver
+  when: not pi_irserver_build
+- name: Build irserver from source (needed on a 64-bit userland, see README)
+  ansible.builtin.include_tasks: build.yml
+  when: pi_irserver_build
 - name: Make config dir for remotes
   ansible.builtin.file:
     path: /usr/bin/remotes