Too difficult to match the stacktrace of the last instruction
of a program => let's remove these (uninteresting) lines
rather than trying to 'sed' them to make them look the same
on different OS/platform/....


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13906 a5019735-40e9-0310-863c-91ae7b9d1cf9
Remove the 2 sed expressions that were trying to massage the
stacktrace for the last program instruction encountered with
  --vgdb-stop-at=exit
These are not needed anymore, as these lines are now removed


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13907 a5019735-40e9-0310-863c-91ae7b9d1cf9