[PATCH v2] Reduce memory size of tsearch red-black tree.

[Florian Weimer]

* Adhemerval Zanella:

> I think it addressed both Florian runtime assert and the macro define 
> name. I would prefer to just remove the old implementation since now the
> optimized one is the default but I think we can remove it a future
> cleanup.  LGMT.

Agreed.