Fix building with xulrunner-1.9.1-r1, bug 278917

Patch taken from http://bugs.gentoo.org/show_bug.cgi?id=263990

--
--- a/mozilla/MozRegisterComponents.cpp~	2009-07-25 10:08:06.182333088 +0200
+++ b/mozilla/MozRegisterComponents.cpp	2009-07-25 12:06:46.254122116 +0200
@@ -44,6 +44,7 @@
 
 #ifdef HAVE_NSIXULAPPINFO_H
 #include <nsXULAppAPI.h>
+#include <nsXPCOMCIDInternal.h>
 #include "EphyXULAppInfo.h"
 #endif