Link cl_khronos_vendor_id to OpenCL 3.0 in cl.xml

See script to check for orphans in KhronosGroup#730

Author: alycm

xml/cl.xml

@@ -5031,6 +5031,10 @@ server's OpenCL/api-docs repository.
             <enum name="CL_DEVICE_QUEUE_SUPPORTED"/>
             <enum name="CL_DEVICE_QUEUE_REPLACEABLE_DEFAULT"/>
         </require>
+        <require comment="cl_khronos_vendor_id">
+            <enum name="CL_KHRONOS_VENDOR_ID_CODEPLAY"/>
+            <enum name="CL_KHRONOS_VENDOR_ID_POCL"/>
+        </require>
         <require comment="cl_platform_info">
             <enum name="CL_PLATFORM_NUMERIC_VERSION"/>
             <enum name="CL_PLATFORM_EXTENSIONS_WITH_VERSION"/>