Control: retitle -1 libgpuarray: *gemv broken on libclblast
For now I have disabled *gemv when used with libclblast, to make this bug an explicit error rather than a silently wrong answer.
These functions are still available with clblas, but that has enough other issues (https://bugs.debian.org/cgi-bin/pkgreport.cgi?src=clblas) that it has been removed from Debian testing.
(The autopkgtest failures on armel/armhf look like a separate bug, possibly in pocl rather than here.)
