Switch WaylandClient platform plugins to target check

Just like DBus and WaylandCompositor do

CMakeLists.txt

@@ -11,9 +11,7 @@ endif()
 if (LINUX AND NOT DESKTOP_APP_USE_PACKAGED)
     add_subdirectory(linux_xcb_helper)
 endif()
-if (LINUX
-    AND NOT DESKTOP_APP_USE_PACKAGED
-    AND NOT DESKTOP_APP_DISABLE_WAYLAND_INTEGRATION)
+if (LINUX AND NOT DESKTOP_APP_USE_PACKAGED)
     add_subdirectory(linux_wayland_helper)
 endif()
 if (DESKTOP_APP_USE_ALLOCATION_TRACER)

external/qt/CMakeLists.txt

@@ -220,7 +220,7 @@ else()
             $<TARGET_OBJECTS:Qt${QT_VERSION_MAJOR}::QXdgDesktopPortalThemePlugin_init>
         )
     endif()
-    if (NOT DESKTOP_APP_DISABLE_WAYLAND_INTEGRATION)
+    if (TARGET Qt::WaylandClient)
         list(PREPEND qt_libs
             plugins/platforms/${qt_lib_prefix}qwayland-generic
             plugins/platforms/${qt_lib_prefix}qwayland-egl
@@ -305,7 +305,7 @@ if (LINUX)
         xcb-render-util
         xcb-keysyms
     )
-    if (NOT DESKTOP_APP_DISABLE_WAYLAND_INTEGRATION)
+    if (TARGET Qt::WaylandClient)
         target_link_libraries(external_qt
         INTERFACE
             desktop-app::linux_wayland_helper

external/qt/package.cmake

@@ -48,12 +48,7 @@ endif()
 cmake_dependent_option(DESKTOP_APP_DISABLE_WAYLAND_INTEGRATION "Disable all code for Wayland integration." OFF "LINUX; qt_version_6_5_or_greater" ON)
 
 if (LINUX)
-    if (NOT DESKTOP_APP_DISABLE_WAYLAND_INTEGRATION)
-        find_package(Qt${QT_VERSION_MAJOR} COMPONENTS WaylandClient REQUIRED)
-        find_package(Qt${QT_VERSION_MAJOR} OPTIONAL_COMPONENTS WaylandCompositor QUIET)
-    endif()
-
-    find_package(Qt${QT_VERSION_MAJOR} OPTIONAL_COMPONENTS DBus QUIET)
+    find_package(Qt${QT_VERSION_MAJOR} OPTIONAL_COMPONENTS DBus WaylandClient WaylandCompositor QUIET)
 endif()
 
 set_property(GLOBAL PROPERTY AUTOGEN_SOURCE_GROUP "(gen)")