- when calling command buffer APIs, test with `command_queue != NULL`
should return `CL_INVALID_VALUE` only if the device doesn't support
`cl_khr_command_buffer_multi_device` (added `Skip`)
- some tests enqueued commands with multiple invalid arguments, e.g.
`clCommandCopyImageToBufferKHR` with two images and invalid sync points.
AFAIK the order of argument checking is not defined, so implementation
can return any valid error value for such API calls, but the tests
assumed only one particular error would be returned. Fix the API calls
to be unambiguous.
769984b023