[PATCH v2] sys/tree.h: Add prototype and generate macros

[Konstantin Belousov]

On Fri, Jan 23, 2015 at 03:11:28PM +0100, Sebastian Huber wrote:
> Provide individual prototype and generate macros for the red-black tree.
> This helps to reduce code size in statically linked applications.

Committed as r277642.  Thank you.