python: apply CV_OVERRIDE/CV_FINAL

modules/python/src2/cv2.cpp

@@ -158,7 +158,7 @@ public:
         return u;
     }
 
-    UMatData* allocate(int dims0, const int* sizes, int type, void* data, size_t* step, int flags, UMatUsageFlags usageFlags) const
+    UMatData* allocate(int dims0, const int* sizes, int type, void* data, size_t* step, int flags, UMatUsageFlags usageFlags) const CV_OVERRIDE
     {
         if( data != 0 )
         {
@@ -187,12 +187,12 @@ public:
         return allocate(o, dims0, sizes, type, step);
     }
 
-    bool allocate(UMatData* u, int accessFlags, UMatUsageFlags usageFlags) const
+    bool allocate(UMatData* u, int accessFlags, UMatUsageFlags usageFlags) const CV_OVERRIDE
     {
         return stdAllocator->allocate(u, accessFlags, usageFlags);
     }
 
-    void deallocate(UMatData* u) const
+    void deallocate(UMatData* u) const CV_OVERRIDE
     {
         if(!u)
             return;