Test/sangshuduo/td 13408 move example back for 2.4 (#10203)

* [TD-13408]<test>: add example back

for 2.4

* modify packaging script

* add examples/c in CMakeLists.txt

CMakeLists.txt

@@ -70,5 +70,6 @@ INCLUDE(cmake/install.inc)
 ADD_SUBDIRECTORY(deps)
 ADD_SUBDIRECTORY(src)
 ADD_SUBDIRECTORY(tests)
+ADD_SUBDIRECTORY(examples/c)
 
 INCLUDE(CPack)