move modules/squashfs.nix into outputs/

modules/all-modules.nix

@@ -30,7 +30,6 @@
    ./outputs/vmroot.nix
    ./ppp
    ./ramdisk.nix
-   ./squashfs.nix
    ./ssh
    ./users.nix
    ./vlan

modules/outputs.nix

@@ -11,7 +11,7 @@ let
 in
 {
   imports = [
-    ./squashfs.nix
+    ./outputs/squashfs.nix
     ./outputs/vmroot.nix
     ./outputs/extlinux.nix
   ];

tests/jffs2/configuration.nix

@@ -4,7 +4,7 @@ let
 in {
   imports = [
     ../../vanilla-configuration.nix
-    ../../modules/squashfs.nix
+    ../../modules/outputs/squashfs.nix
     ../../modules/outputs/jffs2.nix
   ];
   config.rootfsType = "jffs2";