ENH: do not clear find variables

Modules/FindSDL.cmake

@@ -183,7 +183,7 @@ IF(SDL_LIBRARY_TEMP)
   # Set the final string here so the GUI reflects the final state.
   SET(SDL_LIBRARY ${SDL_LIBRARY_TEMP} CACHE STRING "Where the SDL Library can be found")
   # Set the temp variable to INTERNAL so it is not seen in the CMake GUI
-  SET(SDL_LIBRARY_TEMP "" CACHE INTERNAL "")
+  SET(SDL_LIBRARY_TEMP "${SDL_LIBRARY_TEMP}" CACHE INTERNAL "")
 
   SET(SDL_FOUND "YES")
 ENDIF(SDL_LIBRARY_TEMP)

Modules/FindSDL_sound.cmake

@@ -270,7 +270,6 @@ IF(SDL_FOUND AND SDL_SOUND_INCLUDE_DIR AND SDL_SOUND_LIBRARY)
          /opt/csw/lib
        /opt/lib
          )
-       SET(TEMP_SDLSOUND_FIND_VORBIS_FRAMEWORK "" CACHE INTERNAL "")
        IF(VORBIS_LIBRARY)
          SET(SDL_SOUND_LIBRARIES_TMP ${SDL_SOUND_LIBRARIES_TMP} ${VORBIS_LIBRARY})
        ENDIF(VORBIS_LIBRARY)