[gtk] (8 commits) ...Merge branch 'lrn/misc-gtk4-fixes' into 'master'

[Matthias Clasen <matthiasc src gnome org>]

Summary of changes:

  fe76984... Add foward declarations to gtk_print_operation_run_without_ (*)
  dedc1ee... Use const for media type in devmode_to_settings() (*)
  fb4d76d... Add forward declaration for DllMain() in gtkwin32.c (*)
  6bf88d9... W32: don't put a string literal into gtk_libdir (*)
  6e085b3... Pass the correct data to gdk_content_register_serializer() (*)
  8a1106c... W32: Use correct hinstance values (*)
  0db6ee9... GDK W32: don't unref window iconlist textures (*)
  841a298... Merge branch 'lrn/misc-gtk4-fixes' into 'master'

(*) This commit already existed in another branch; no separate mail sent