Link Wayland::Server as an external dependency

Raw wl_ objects are used throughout the public headers repeatedly.

Exporting the linked library helps clients (kwin) build cleanly.

src/wayland/CMakeLists.txt

@@ -345,9 +345,10 @@ ecm_generate_export_header(KWaylandServer
 target_include_directories(KWaylandServer INTERFACE "$<INSTALL_INTERFACE:${KDE_INSTALL_INCLUDEDIR}>")
 
 target_link_libraries(KWaylandServer
-    PUBLIC Qt5::Gui
-    PRIVATE
+    PUBLIC
+        Qt5::Gui
         Wayland::Server
+    PRIVATE
         EGL::EGL
         Qt5::Concurrent
 )

src/wayland/server/screencast_interface.h

@@ -12,6 +12,7 @@
 #include <QSharedPointer>
 #include <functional>
 #include <KWaylandServer/kwaylandserver_export.h>
+#include <wayland-server.h>
 
 struct wl_resource;