Filter lines such as:
+38     ../sysdeps/unix/sysv/linux/_exit.c: No such file or directory.

This should make nlgone_exit work on s390 suse and x86_64 suse


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13913 a5019735-40e9-0310-863c-91ae7b9d1cf9