There is no particular reason to limit the domain of unsigned 32-bit
integers in the input, so use genrand_int32 directly.
Signed-off-by: Stuart Brady <stuart.brady@arm.com>
* Skip `rw_image_access_qualifier` if images are not supported.
* Skip `rw_image_access_qualifier` if read-write images are optionally
not supported on a OpenCL-3.0 or later device.
* Stop assuming `-cl-std=CL3.0` and default to latest OpenCL C supported
by the device.