CMake: Add an ENABLE_NOGUI option

Source/Core/CMakeLists.txt

@@ -2,12 +2,15 @@ add_subdirectory(AudioCommon)
 add_subdirectory(Common)
 add_subdirectory(Core)
 add_subdirectory(DiscIO)
-add_subdirectory(DolphinNoGUI)
 add_subdirectory(InputCommon)
 add_subdirectory(UICommon)
 add_subdirectory(VideoCommon)
 add_subdirectory(VideoBackends)
 
+if(ENABLE_NOGUI)
+  add_subdirectory(DolphinNoGUI)
+endif()
+
 if(ENABLE_QT)
   add_subdirectory(DolphinQt)
 endif()

Source/Core/DolphinNoGUI/CMakeLists.txt

@@ -1,7 +1,3 @@
-if(NOT((ENABLE_X11 AND X11_FOUND) OR ENABLE_HEADLESS))
-  return()
-endif()
-
 add_executable(dolphin-nogui
   Platform.cpp
   PlatformHeadless.cpp