Created by: zhiqiu

The op_function_generator presented in PR21569 needs liboimp5.so(.dll on windows) and libmkldnn.so (.dll on windows) when WITH_MKL and WITH_MKLDNN is on.

This PR carefully copy these dynamic library to the directory where op_function_generator is, and add that directory to LD_LIBRARY_PATH, so op_function_generator can run.

This also fixes #21692 (closed).