update json cmake

cmake/external_libs/json.cmake

@@ -4,11 +4,11 @@ endif()
 
 include(ExternalProject)
 
-set(JSON_SRC_DIR ${PARSER_DIR}/../../third_party/json/include)
+set(JSON_SRC_DIR ${CMAKE_BINARY_DIR}/opensrc/json/include)
 ExternalProject_Add(json_build
                     URL https://github.com/nlohmann/json/releases/download/v3.6.1/include.zip
                     #URL /home/txd/workspace/cloud_code/pkg/include.zip
-                    #SOURCE_DIR  ${JSON_SRC_DIR}
+                    SOURCE_DIR  ${JSON_SRC_DIR}
                     CONFIGURE_COMMAND ""
                     BUILD_COMMAND ""
                     INSTALL_COMMAND ""

metadef

@@ -1 +1 @@
-Subproject commit e79f45025b95a7295bdffa38a1b720bfd6609ae9
+Subproject commit 765d85777ec10fe819799cd2c1b60db49be7c749