I agree that this is probably the same bug as #964973, which is marked as fixed.
The error message has gone for me as well, but I don't have the hardware
to tell whether mesa-opencl-icd actually works. Have you checked this?
- Bug#964791: [Pkg-opencl-devel] Bug#964791: libclc-amdgcn... Diederik de Haas
- Bug#964791: [Pkg-opencl-devel] Bug#964791: Bug#9647... Rebecca N. Palmer
- Bug#964791: [Pkg-opencl-devel] Bug#964791: Bug#... Diederik de Haas