remove dependency on APR library

sample/hub/CMakeLists.txt

@@ -3,13 +3,6 @@ cmake_minimum_required(VERSION 3.0)
 set(DEMO_NAME hub_sample)
 add_executable(${DEMO_NAME} main.c)
 
-if (WIN32)
-add_custom_command(TARGET ${DEMO_NAME} POST_BUILD
-        COMMAND ${CMAKE_COMMAND} -E copy_if_different
-        "${PROJECT_SOURCE_DIR}/third_party/apr/bin/libapr-1.dll"
-        $<TARGET_FILE_DIR:${DEMO_NAME}>)
-endif()
-
 target_link_libraries(${DEMO_NAME}
         PRIVATE
         ${PROJECT_NAME}_static