[Pkg-opencl-devel] beignet 1.2.0

[Rebecca N. Palmer]

Now ready for upload.

> As jessie-backports now has a mesa that uses LLVM/Clang 3.8, we also need to decide whether jessie-backports beignet should match jessie mesa (LLVM/Clang 3.5) or jessie-backports mesa, and if the latter whether it should have a Breaks: on non-backports mesa.  (I've never seen the mismatched-versions crash myself, but I don't usually link beignet and mesa into the same program.)
I went for backports matching backports mesa (though I'd still
like to understand where the mismatched-LLVM-versions problem
actually is, having never seen it myself).