kcMain.cpp:Update cmPrefsInit() to take NULL pathPrefix.

src/kc/kcMain.cpp

 {
   cmPrRC_t rc = kOkPrRC;
 
-  if((rc = cmPrefsInit(ctx, prH, NULL, NULL, NULL, NULL )) != kOkPrRC )
+  if((rc = cmPrefsInit(ctx, prH, NULL, NULL, NULL, NULL, NULL )) != kOkPrRC )
     return rc;
 
   unsigned flags = 0;