仅在有 parent 时设置到 parent 中 (ZLMediaKit#2676)

Author: wasphin

CMakeLists.txt

@@ -462,7 +462,7 @@ if(ENABLE_SERVER)
 endif()
 
 # Android 会 add_subdirectory 并依赖该变量
-if(ENABLE_SERVER_LIB)
+if(ENABLE_SERVER_LIB AND NOT CMAKE_PARENT_LIST_FILE STREQUAL CMAKE_CURRENT_LIST_FILE)
   set(MK_LINK_LIBRARIES ${MK_LINK_LIBRARIES} PARENT_SCOPE)
 endif()