remove old inference C++ tests (#24368) (#26007)

Co-authored-by: Tao Luo <[email protected]>

Author: iducn

paddle/fluid/inference/CMakeLists.txt

@@ -55,12 +55,8 @@ endif()
 # C inference API
 add_subdirectory(capi)
 
-if(WITH_TESTING)
-  # tests/book depends the models that generated by python/paddle/fluid/tests/book
-  add_subdirectory(tests/book)
-  if(WITH_INFERENCE_API_TEST)
+if(WITH_TESTING AND WITH_INFERENCE_API_TEST)
     add_subdirectory(tests/api)
-  endif()
 endif()
 
 set(SHARED_INFERENCE_SRCS