Combining CUDA binaries with GPL code violates the CUDA EULA.

[Geekdude]

Two tests that are part of HeCBench (sss and xlqc) have a BSD license and also have a dependency on GSL which has a GPL license.
Combining CUDA binaries with GPL code unfortunately violates the CUDA EULA.

Potential resolutions:

1. Modify the tests to replace the dependency on GSL with another scientific library that is not GPL.
2. Remove the 2 tests from HeCBench altogether.
3. Make sss and xlqc opt-in (not built by default), with a note of the license clash to users if they opt-in to build them.

[Geekdude]

@keitaTN and @zjin-lcf how should we resolve this license conflict?

[Geekdude]

Resolved by #321 .