g++ before 3.x does not have the clear() method on strings

	-mi

--- HashDataFile.cc	Mon Mar 28 14:58:25 2005
+++ HashDataFile.cc	Wed Jun 22 17:27:02 2005
@@ -233,5 +233,7 @@
     m_array.reset(0, 0);
     m_base = 0;
+#if !defined(__GNUC__) || __GNUC__ > 2
     m_filename.clear();
+#endif
   }
 }