Build issues - library paths, and debian pkg format

[Arran Cudbard-Bell]

> On 5 Dec 2014, at 14:46, Bruce Bauman <bbauman at oit.rutgers.edu> wrote:
> 
> I had the same problem and it was only with that file.
> 
> Although I don’t understand why, commenting out the TGT_PREREQS line in src/modules/rlm_cache/rlm_cache.mk made the problem go away for me.
> 

Not sure why Alan added those. Looks invalid to me.

rbtree module isn't depended on by rlm_cache, likewise rlm_cache_rbtree doesn't depend on rlm_cache, build ordering doesn't matter...

-Arran