hackbench-svn1649-bp151.3.1

- Cleanup spec-file with spec-cleaner

- patch license to follow spdx.org standard

- cross-build fix: use %__cc macro

- make patch0 usage consistent

- Updated to r1648:
  o added test description (README)
  o helper scripts to run hackbench test
  o plot script to plot test resutls

- Initial checkin of hackbench (Version r1648 (SLERT SVN))