dlopen is not a subsystem

CMakeLists.txt

@@ -361,7 +361,7 @@ set(LONGESTOPTIONNAME 0)  # set_option and friends will change this.
 
 set(SDL_SUBSYSTEMS
     Atomic Audio Video Render Events Joystick Haptic Hidapi Power Threads Timers
-    File Loadso CPUinfo Filesystem Dlopen Sensor Locale Misc)
+    File Loadso CPUinfo Filesystem Sensor Locale Misc)
 foreach(_SUB ${SDL_SUBSYSTEMS})
   string(TOUPPER ${_SUB} _OPT)
   if (NOT DEFINED SDL_${_OPT}_ENABLED_BY_DEFAULT)