OpenVDB: Support build without delay loading

extern/mantaflow/preprocessed/fileio/iovdb.cpp

@@ -599,7 +599,9 @@ int readObjectsVDB(const string &filename, std::vector<PbClass *> *objects, floa
   registerCustomCodecs();
 
   try {
+#ifdef OPENVDB_USE_DELAYED_LOADING
     file.setCopyMaxBytes(0);
+#endif
     file.open();
     gridsVDB = *(file.getGrids());
     openvdb::MetaMap::Ptr metadata = file.getMetadata();

intern/cycles/hydra/field.cpp

@@ -31,7 +31,9 @@ class HdCyclesVolumeLoader : public VDBImageLoader {
     const bool delay_load = false;
     try {
       openvdb::io::File file(filePath);
+#  ifdef OPENVDB_USE_DELAYED_LOADING
       file.setCopyMaxBytes(0);
+#  endif
       if (file.open(delay_load)) {
         grid = file.readGrid(gridName);
       }

source/blender/blenkernel/intern/volume_grid_file_cache.cc

@@ -89,7 +89,9 @@ static FileCache create_file_cache(const StringRef file_path)
     /* Disable delay loading and file copying, this has poor performance
      * on network drives. */
     const bool delay_load = false;
+#  ifdef OPENVDB_USE_DELAYED_LOADING
     file.setCopyMaxBytes(0);
+#  endif
     file.open(delay_load);
     vdb_grids = *(file.readAllGridMetadata());
     file_cache.meta_data = *file.getMetadata();
@@ -185,7 +187,9 @@ static openvdb::GridBase::Ptr load_single_grid_from_disk(const StringRef file_pa
   const bool delay_load = false;
 
   openvdb::io::File file(file_path);
+#  ifdef OPENVDB_USE_DELAYED_LOADING
   file.setCopyMaxBytes(0);
+#  endif
   file.open(delay_load);
   return file.readGrid(grid_name);
 }