Add config/local/isa.h

iPXE build failed for me with latest version without this.

roles/netbootxyz/tasks/generate_disks_base.yml

@@ -81,6 +81,7 @@
     - src/config/local/crypto.h
     - src/config/local/usb.h
     - src/config/local/settings.h
+    - src/config/local/isa.h
 
 - name: Retrieve iPXE CA
   ansible.builtin.get_url: