st/clover: Define __OPENCL_VERSION__ on the device side

This is required by the OpenCL standard.

Signed-off-by: Niels Ole Salscheider <niels_ole@salscheider-online.de>
Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Vedran Miletić <vedran@miletic.net>
1 file changed