Switch from EXTRA_LIBS to SDL_EXTRA_LIBS

CMakeLists.txt

@@ -1538,7 +1538,7 @@ elseif(UNIX AND NOT APPLE AND NOT RISCOS AND NOT HAIKU)
         set(SDL_AUDIO_DRIVER_QNX 1)
         file(GLOB QNX_AUDIO_SOURCES ${SDL3_SOURCE_DIR}/src/audio/qnx/*.c)
         list(APPEND SOURCE_FILES ${QNX_AUDIO_SOURCES})
-        list(APPEND EXTRA_LIBS asound)
+        list(APPEND SDL_EXTRA_LIBS asound)
         set(HAVE_SDL_AUDIO TRUE)
     endif()
     CheckOSS()

cmake/sdlchecks.cmake

@@ -767,7 +767,7 @@ macro(CheckQNXScreen)
       set(SDL_VIDEO_DRIVER_QNX 1)
       file(GLOB QNX_VIDEO_SOURCES ${SDL3_SOURCE_DIR}/src/video/qnx/*.c)
       list(APPEND SOURCE_FILES ${QNX_VIDEO_SOURCES})
-      list(APPEND EXTRA_LIBS screen EGL)
+      list(APPEND SDL_EXTRA_LIBS screen EGL)
     endif()
   endif()
 endmacro()