bug#65008: 29.1; Feature: dired-mouse-drag-files for Wayland

[Huan Thieu Nguyen]

Hi, why does this feature exclude Wayland? It's possible to do with
GTK3. I might be able to help, but I've only done it with GTK4 which
changed it a bit 
<https://docs.gtk.org/gtk4/migrating-3to4.html#switch-to-the-new-drag-and-drop-api>

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