[Beignet] wrong CMAKE_LIBRARY_ARCHITECTURE on x86_64

[Igor Gnatenko]

Hi,

I'm updating beignet to 1.0.2 in Fedora as packager and see that on
x86_64 I have CMAKE_LIBRARY_ARCHITECTURE equal to nothing and have
intel-beignet-.icd.

P.S. don't have time to file a bug.
-- 
-Igor Gnatenko