OpenMP build fix for libxsmm-dnn (#1046)

Author: rengolin

cmake/modules/xsmm-dnn.cmake

@@ -46,6 +46,6 @@ target_include_directories(xsmm_dnn_mlp PRIVATE ${XSMM_DNN_INCLUDE_DIRS})
 target_link_libraries(xsmm_dnn_mlp PRIVATE xsmm)
 if (OPENMP_FOUND)
   target_compile_options(xsmm_dnn_mlp PRIVATE ${OpenMP_C_FLAGS})
-  target_link_libraries(xsmm_dnn_mlp PRIVATE ${OpenMP_C_LIB_NAMES})
+  target_link_libraries(xsmm_dnn_mlp PRIVATE ${OpenMP_C_LIBRARIES})
 endif()
 install(TARGETS xsmm_dnn_mlp RUNTIME DESTINATION bin)