Emulate other architectures in owl nodes too

Allows cross-compilation of packages for RISC-V that are known to try to
run RISC-V programs in the host.

Reviewed-by: Aleix Boné <abonerib@bsc.es>

m/owl1/configuration.nix

@@ -4,6 +4,7 @@
   imports = [
     ../common/xeon.nix
     ../module/ceph.nix
+    ../module/emulation.nix
     ../module/slurm-client.nix
     ../module/slurm-firewall.nix
     ../module/slurm-hut-nix-store.nix