make transaction WriteOptions modifiable

include/rocksdb/utilities/transaction.h

@@ -356,7 +356,7 @@ class Transaction {
   virtual void SetLockTimeout(int64_t timeout) = 0;
 
   // Return the WriteOptions that will be used during Commit()
-  virtual const WriteOptions* GetWriteOptions() = 0;
+  virtual WriteOptions* GetWriteOptions() = 0;
 
   // Reset the WriteOptions that will be used during Commit().
   virtual void SetWriteOptions(const WriteOptions& write_options) = 0;

utilities/transactions/transaction_base.h

@@ -204,7 +204,7 @@ class TransactionBaseImpl : public Transaction {
   // with writes in other transactions.
   const TransactionKeyMap& GetTrackedKeys() const { return tracked_keys_; }
 
-  const WriteOptions* GetWriteOptions() override { return &write_options_; }
+  WriteOptions* GetWriteOptions() override { return &write_options_; }
 
   void SetWriteOptions(const WriteOptions& write_options) override {
     write_options_ = write_options;