set heuristic GC -- math arrays are not correctly traced by GC with metadata

git-svn-id: https://svn.inf.ethz.ch/svn/lecturers/a2/trunk@7159 8c9fc860-2736-0410-a75d-ab315db34111

WinAos/aosg.ini

@@ -11,7 +11,7 @@ Boot3 = WindowManager.Install
 Boot4 = Clipboard.Install
 Boot5 = FSTools.Mount WORK RelativeFileSystem ./
 Boot7 = Autostart.Run
-Boot8 = Heaps.SetMetaData
+Boot8 = Heaps.SetHeuristics
 Boot9 = Kernel.GC
 ObjectFileExtension=.GofW
 Trace=File