Removing extra copy of rb_tree stuff

[Paul Goyette <paul%whooppee.com@localhost>]

I'm looking at PR lib/44090, which requests that libprop be modified to 
use the "main" copy of rb_tree rather than its local copy, and then 
remove the local copy.

Well, part 1 is already done.  The prop_rb_impl.h header already has a 
section that redefined the "local" function names to reference the 
"real" functions (conditionalized on defined(__NetBSD__)), and the 
Makefile.inc already includes the prop_rb.c file only if PROPLIB_WANT_RB 
is defined (which it never seems to be).

The question comes down to part 2 of the PR - removal of the extra copy.

The changes in the header file would imply that this code might be used 
in projects other than NetBSD.  If this were the case, it might make 
sense to keep the extra code around; it's not really hurting anything. 
But because it's not being built, it might well suffer from future 
bit-rot.

So, would it be better to keep the extra code copy in the tree (just in 
case some other project uses it) and let it rot?  Or should I delete the 
extra copy, and adjust the (relatively small number of) callers to use 
the "real" function names rather than the local names?

Recommendations requested!



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