improve the use of fervor lib in main cmake file

CMakeLists.txt

@@ -80,8 +80,8 @@ INCLUDE( cmake/LibFFmpeg.cmake )
 IF( USE_FERVOR )
   SET( FERVOR_APP_NAME ${PROJECT_NAME} ) 
   SET( FERVOR_APP_VERSION ${PLAYUVER_VERSION} )
-  ADD_SUBDIRECTORY( fervor )
-  INCLUDE_DIRECTORIES( fervor )
+  ADD_SUBDIRECTORY( source/lib/fervor-lib )
+  INCLUDE_DIRECTORIES( source/lib/fervor-lib )
   LIST(APPEND LINKER_LIBS "Fervor" )
 ENDIF()