CMake: hardcode the Qt UI option to ON on Windows

CMakeLists.txt

@@ -136,9 +136,14 @@ option(NEW_DYNAREC  "Use the PCem v15 (\"new\") dynamic recompiler"
 option(MINITRACE    "Enable Chrome tracing using the modified minitrace library"    OFF)
 option(GDBSTUB      "Enable GDB stub server for debugging"                          OFF)
 option(DEV_BRANCH   "Development branch"                                            OFF)
-option(QT           "Qt GUI"                                                        ON)
 option(DISCORD      "Discord Rich Presence support"                                 ON)
 
+if(WIN32)
+    set(QT ON)
+else()
+    option(QT "Qt GUI" ON)
+endif()
+
 # Development branch features
 #
 #                      Option         Description                                   Def.    Condition       Otherwise

src/CMakeLists.txt

@@ -226,8 +226,6 @@ endif()
 
 if (QT)
     add_subdirectory(qt)
-elseif(WIN32)
-    add_subdirectory(win)
 else()
     add_compile_definitions(USE_SDL_UI)
     add_subdirectory(unix)