sddm: Move to libsForQt5*

Part of #101369: Inherit it in aliases.nix, for backwards compatibility.

pkgs/top-level/aliases.nix

@@ -802,5 +802,8 @@ mapAliases ({
     kwin-tiling
     krohnkite
   ;
+  inherit (libsForQt5)
+    sddm
+  ;
 
 })

pkgs/top-level/all-packages.nix

@@ -15344,6 +15344,9 @@ in
 
     qtwebkit-plugins = callPackage ../development/libraries/qtwebkit-plugins { };
 
+    # Not a library, but we do want it to be built for every qt version there
+    # is, to allow users to choose the right build if needed.
+    sddm = callPackage ../applications/display-managers/sddm { };
   };
 
   qtEnv = qt5.env;
@@ -23485,8 +23488,6 @@ in
 
   robustirc-bridge = callPackage ../servers/irc/robustirc-bridge { };
 
-  sddm = libsForQt514.callPackage ../applications/display-managers/sddm { };
-
   skrooge = libsForQt514.callPackage ../applications/office/skrooge {};
 
   smartgithg = callPackage ../applications/version-management/smartgithg {