Add missing header guard endif comment

Author: peterschrammel

src/java_bytecode/java_entry_point.h

@@ -34,4 +34,4 @@ main_function_resultt get_main_symbol(
   message_handlert &,
   bool allow_no_body=false);
 
-#endif
+#endif // CPROVER_JAVA_BYTECODE_JAVA_ENTRY_POINT_H