gdk/wayland: Add support for primary-selection-unstable-v1

Merged Robert Mader requested to merge rmader/gtk:issue2591 into gtk-3-24

Additionally to gtk_primary_selection, the gtk-private predecessor, support the upstream unstable protocol.

This allows the primary selection to work on Kwin and potentially other compositors, as well as dropping the private version eventually.

Closes #2591 (closed)

See also !2630 (merged)

Edited by Robert Mader

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