buildroots.xml - comps for buildroots

[seth vidal]

> I'd say redhat-rpm-config is missing from build, as it won't be pulled in
> automatically, and without it you'll get unexpected results, like not
> getting debuginfo packages created and having the main binary packages
> unstripped...
> 
> Also, we could decide as to whether we want to include gcc-c++, as it's
> needed by many packages, even many that have nothing to do with C++ but
> require it because of libtool/autotools.
> 

good point on redhat-rpm-config. 
-sv