Require override for Houdini builds now.

Signed-off-by: jlait <[email protected]>

Author: jmlait

openvdb_houdini/openvdb_houdini/SOP_OpenVDB_Merge.cc

@@ -44,7 +44,7 @@ class SOP_OpenVDB_Merge: public hvdb::SOP_NodeVDB
     public:
         fpreal getTime() const { return mTime; }
     protected:
-        OP_ERROR cookVDBSop(OP_Context&) final;
+        OP_ERROR cookVDBSop(OP_Context&) override final;
     private:
         fpreal mTime = 0.0;
     };