8215130: Fix errors in LittleCMS 2.9 reported by GCC 8

Reviewed-by: prr

--HG--
extra : rebase_source : f87fbf5924564b9c869ff26acf3b15b313844563

src/java.desktop/share/native/liblcms/cmsxform.c

@@ -836,7 +836,7 @@ _cmsTRANSFORM* AllocEmptyTransform(cmsContext ContextID, cmsPipeline* lut,
 
                             // Save the day? (Ignore the warning)
                             if (Plugin->OldXform) {
-                                   p->OldXform = (_cmsTransformFn) p->xform;
+                                   p->OldXform = (_cmsTransformFn)(void*) p->xform;
                                    p->xform = _cmsTransform2toTransformAdaptor;
                             }