Bug#1021695: Correcting the rocprim ITP

[Cordell Bloor <cgmb@slerp.xyz>]

retitle 1021695 ITP: rocprim -- parallel primitives for GPU-accelerated code
thanks

The source package name is rocprim and the binary package is 
librocprim-dev. My apologies for the error. I'm slowing getting the hang 
of the Debian tooling and processes, but I'm not quite there yet.

I also made a mistake in stating its language. All the headers are *.hpp 
files. There's no C API. I'm also a bit unclear on whether any of the 
headers could be used with a normal C++ compiler and which headers 
require HIP extensions. In any case, rocPRIM would be the second HIP 
language library to be packaged for Debian after rocRAND.

Sincerely,
Cory Bloor