Removal of DNDEBUG caused Write performance degradation

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Upgrade to last 5.13.2 version

### Expected behavior

Performance of write operation is the same

### Actual behavior

2x performance degradation

### Steps to reproduce the behavior

The problem is that key -DNDEBUG was remove from the place specified in my commit:

https://github.com/toktarev/rocksdb/commit/0f083b05cc305f1316245838dc057596b0000420.

As result we see 2x performance degradation