correct ratification status for cl_khr_icd_unloadable (#1510)

Author: bashbaug

xml/cl.xml

@@ -5933,7 +5933,7 @@ server's OpenCL/api-docs repository.
                 <command name="clIcdSetPlatformDispatchDataKHR"/>
             </require>
         </extension>
-        <extension name="cl_khr_icd_unloadable" revision="1.0.0" supported="opencl" ratified="opencl">
+        <extension name="cl_khr_icd_unloadable" revision="1.0.0" supported="opencl">
             <require>
                 <type name="CL/cl.h"/>
             </require>