DLZ modules

[Evan Hunt]

> Just a short PS:
> 
> I think this is not quite mature, as eg in the file
> contrib/dlz/modules/include/dlz_pthread.h
> there is a "#endif /* ifdef PTHREADS */" but no "#ifdef PTHREADS"

Whoops, thanks for pointing this out. Looks like a backporting
glitch we missed - the problem isn't in the main development branch,
but is in 9.16 and 9.11.

-- 
Evan Hunt -- each at isc.org
Internet Systems Consortium, Inc.