[Beignet] [PATCH] Enable multiarch (32/64-bit co-installation)

[Rebecca N. Palmer]

> As to the multi-arch support for beignet, I assume the requirement is from
> running 32-bit binary on a 64-bit system. Right?
Yes.

> Then the 32bit application will call to ocl-icd to search available icd files.
> I never test it and don't know whether the ocl-icd library will choose the
> 32bit beignet icd file rather than the 64 bit beignet icd file.
>
> On the other hand, if we are runing a 64 bit application, is there already a
> mechanism to make sure it will get the 64-bit beignet icd file rather than
> the 32-bit?
dlopen() fails (with "wrong ELFCLASS") on trying to load a 32-bit 
library into a 64-bit application or vice versa, and ocl-icd skips over 
any ICDs returning such an error: 
http://sources.debian.net/src/ocl-icd/2.2.3-1/ocl_icd_loader.c/#L186