Fix remote delta backup

src/data.c

@@ -667,7 +667,7 @@ backup_data_file(backup_files_arg* arguments,
 	 */
 	if (n_blocks_read != 0 && n_blocks_read == n_blocks_skipped)
 	{
-		if (remove(to_path) == -1)
+		if (fio_unlink(to_path, FIO_BACKUP_HOST) == -1)
 			elog(ERROR, "cannot remove file \"%s\": %s", to_path,
 				 strerror(errno));
 		return false;

src/delete.c

@@ -296,7 +296,7 @@ delete_backup_files(pgBackup *backup)
 			elog(INFO, "Progress: (%zd/%zd). Process file \"%s\"",
 				 i + 1, num_files, file->path);
 
-		pgFileDelete(file);
+		fio_unlink(file->path, FIO_BACKUP_HOST);
 	}
 
 	parray_walk(files, pgFileFree);