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(1.8) wayland: restore support for pre wayland 1.20
The wl_proxy_marshal_{array_,}flags API was introduced with wayland
1.19.91, so guard on those when building waffle. Otherwise we'll fail to
dlsym the respective symbols at runtime.
Fixes: 2c335972 ("wayland: fix build against version 1.20")
(cherry picked from commit d90b0cb5)