Please give back tbb on powerpc

[Mathieu Malaterre <malat@debian.org>]

Please give back tbb on powerpc. For some reason tbb is known to build
and run fine on ppc. However it is currently marked as: 'Not-For-Us'
for powerpc (maybe I am missing something here!).

As a side note, ppc64 buildd went perfectly fine, and tbb build fine
on my home ppc computer.

gb tbb_4.0+r233-1 . powerpc .



Thanks
-- 
Mathieu