xml: require CL/GL types for cl_khr_gl_sharing (#1210)

So the type definitions are included in the generated cl_gl.h

Change-Id: I65a666dde8066958897acf13fb755ae2a3f3b52d

Signed-off-by: Kevin Petit <kevin.petit@arm.com>

Author: kpet

xml/cl.xml

@@ -6566,6 +6566,11 @@ server's OpenCL/api-docs repository.
             <require>
                 <type name="CL/cl.h"/>
             </require>
+            <require>
+                <type name="cl_GLint"/>
+                <type name="cl_GLenum"/>
+                <type name="cl_GLuint"/>
+            </require>
             <require>
                 <type name="cl_gl_context_info"/>
             </require>