Bug#992673: libgpuarray: *gemv broken on libclblast

[Rebecca N. Palmer]

There's also this test failure on arm64 (which is at least a crash not a 
wrong answer), again with clblast not clblas.  It probably isn't a new 
problem either: the tests were previously run with clblas only.

(The "regression" on ppc64el is that the test has never been installable 
there and we're no longer ignoring that, i.e. not actually a regression.)

======================================================================
ERROR: pygpu.tests.test_blas.test_ger(64, 64, 'float32', 'f', 1, 1, 
True, False)
----------------------------------------------------------------------
Traceback (most recent call last):
   File "/usr/lib/python3/dist-packages/nose/case.py", line 197, in runTest
     self.test(*self.arg)
   File "/usr/lib/python3/dist-packages/pygpu/tests/test_blas.py", line 
22, in f
     func(*args, **kwargs)
   File "/usr/lib/python3/dist-packages/pygpu/tests/test_blas.py", line 
192, in ger
     gr = gblas.ger(1.0, gX, gY, gA, overwrite_a=overwrite)
   File "pygpu/blas.pyx", line 167, in pygpu.blas.ger
   File "pygpu/blas.pyx", line 55, in pygpu.blas.pygpu_blas_rger
pygpu.gpuarray.GpuArrayException: (b'CLBlastSger(convO(order), M, N, 
alpha, X->buf, offX, incX, Y->buf, offY, incY, A->buf, offA, lda, 
&ctx->q, &ev): Unknown error', 11)