[Pkg-opencl-devel] Bug#949767: causes autopkgtest regression in libgpuarray

[Rebecca N. Palmer]

(The above debci log is misleading due to #764081; pocl also changed, 
and the failure goes away on using the old pocl.)

It looks like this fails because it is reading the result before the 
computation has finished:
- On a failure, the np.asarray(gr) passed to assert_allclose doesn't 
match cr (hence the fail), but np.asarray(gr) run manually from the 
debugger (i.e. later) does match cr.
- Adding a time.sleep(0.1) to the test stops that test failing.
- Which tests fail varies from run to run.

I don't yet know if this is pocl's or libgpuarray's fault.