cmake: remove Qt6::GuiPrivate dependency on WIN32 and APPLE

cmake/SearchForStuff.cmake

@@ -110,9 +110,11 @@ disable_compiler_warnings_for_target(speex)
 if(ENABLE_QT_UI)
 	find_package(Qt6 6.10.0 COMPONENTS CoreTools Core GuiTools Gui WidgetsTools Widgets LinguistTools REQUIRED)
 
+	if(NOT WIN32 AND NOT APPLE)
 		if (Qt6_VERSION VERSION_GREATER_EQUAL 6.10.0)
 			find_package(Qt6 COMPONENTS CorePrivate GuiPrivate WidgetsPrivate REQUIRED)
 		endif()
+	endif()
 
 	# The docking system for the debugger.
 	find_package(KDDockWidgets-qt6 2.3.0 REQUIRED)

pcsx2-qt/CMakeLists.txt

@@ -289,11 +289,14 @@ target_link_libraries(pcsx2-qt PRIVATE
 	PCSX2
 	Qt6::Core
 	Qt6::Gui
-	Qt6::GuiPrivate
 	Qt6::Widgets
 	KDAB::kddockwidgets
 )
 
+if(NOT WIN32 AND NOT APPLE)
+	target_link_libraries(pcsx2-qt PRIVATE Qt6::GuiPrivate)
+endif()
+
 # Our Qt builds may have exceptions on, so force them off.
 target_compile_definitions(pcsx2-qt PRIVATE QT_NO_EXCEPTIONS)
 

pcsx2-qt/DisplayWidget.cpp

@@ -26,8 +26,6 @@
 
 #if defined(_WIN32)
 #include "common/RedtapeWindows.h"
-#elif !defined(APPLE)
-#include <qpa/qplatformnativeinterface.h>
 #endif
 
 DisplaySurface::DisplaySurface()