Merge pull request #12449 from Nuzhny007:master

* Fixed compilation error WITH_OPENMP under Windows

* Move up OpenMP condition

modules/core/src/parallel.cpp

@@ -410,6 +410,8 @@ namespace
                     });
         }
     };
+#elif defined HAVE_OPENMP
+    typedef ParallelLoopBodyWrapper ProxyLoopBody;
 #elif defined HAVE_GCD
     typedef ParallelLoopBodyWrapper ProxyLoopBody;
     static void block_function(void* context, size_t index)