Add changed_when to makepkg command

roles/powershell/tasks/main.yml

@@ -11,3 +11,5 @@
     cmd: makepkg -cirs --needed
     chdir: ~/builds/powershell-bin
   when: ansible_distribution == 'Archlinux'
+  register: result
+  changed_when: "'installing existing package' not in result.stderr"

roles/protonvpn/tasks/main.yml

@@ -26,6 +26,8 @@
     cmd: makepkg -cirs --needed
     chdir: ~/builds/openvpn-update-systemd-resolved
   when: ansible_distribution == 'Archlinux'
+  register: result
+  changed_when: "'installing existing package' not in result.stderr"
 
 - name: Copy client confs
   become: true