Fix CMAKE_CXX_FLAGS optimize flag (#14059)

Author: Hirozy

deploy/cpp_infer/CMakeLists.txt

@@ -71,7 +71,7 @@ else()
     if(WITH_MKL)
         set(FLAG_OPENMP "-fopenmp")
     endif()
-    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -o3 ${FLAG_OPENMP} -std=c++11")
+    set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -g -O3 ${FLAG_OPENMP} -std=c++11")
     set(CMAKE_STATIC_LIBRARY_PREFIX "")
     message("cmake cxx flags" ${CMAKE_CXX_FLAGS})
 endif()