The .rgba vector component accessors are supported in OpenCL C 3.0.
Previously, the diagnostic would check OpenCLVersion for version 2.2
(value 220) and report those accessors are an OpenCL 2.2 feature.
However, there is no "OpenCL C version 2.2", so change the check and
diagnostic text to 3.0 only.
A spurious OpenCLVersion argument was passed into the diagnostic;