Add papi and nosv to cross-compilation CI

Reviewed-by: Rodrigo Arias Mallo <rodrigo.arias@bsc.es>

pkgs/nosv/default.nix

@@ -68,5 +68,6 @@ in
       maintainers = with lib.maintainers.bsc; [ abonerib rarias ];
       platforms = lib.platforms.linux;
       license = lib.licenses.gpl3Plus;
+      cross = true;
     };
   }

pkgs/papi/default.nix

@@ -26,4 +26,6 @@ else
       "--with-arch=${stdenv.hostPlatform.uname.processor}"
     ];
     patches = (old.patches or [ ]) ++ [ ./fix-ar-cross.patch ];
+
+    meta = old.meta // { cross = true; };
   })