[Piglit] usage of C++11 STL features in a Piglit test

[Jon Ashburn]

I am working on Piglit tests for arb_texture_view.  I was considering 
using C++11 features  in STL  (e.g. unordered_set).  Any reason not to 
use these newer  STL features  if they are supported in the newer 
versions of g++ as found on recent Ubuntu distributions? In particular,
wondering if compilers on other platforms  which Piglit might support
have reasonably thorough C++11 support?

For GNU compiler C++11 features require -std=c++11 or -std=gnu++11 
compiler options.

I can always fall back to implementing test using non-C++11 features.

Thanks,
Jon Ashburn