Fix for compilers that can't deal with the extra ; that results in an "incorrectly terminated declaration" (namely Sun's Workshop 5.0 & AIX's xlC)

rdf/content/src/nsXULRadioGroupElement.h

@@ -53,7 +53,7 @@ public:
     NS_FORWARD_IDOMXULELEMENT(mOuter->);
 
     // nsIDOMXULRadioGroupElement interface
-    NS_DECL_IDOMXULRADIOGROUPELEMENT;
+    NS_DECL_IDOMXULRADIOGROUPELEMENT
 
 protected:
     nsCOMPtr<nsIDOMXULRadioElement> mSelectedItem;