This program is a shell script that checks all running programs to see if they're still using the old gnulibc1 (libc.so.5).
Download and run the shell script. It would probably be best to fork it off your console (redirect its output to some file). Does not need root.
./libc5-check > /tmp/libc5-log &
Simple shell recipe
(for file in bin/* sbin/* ; do if ldd $file | grep gnulibc1/lib-compat -s -q; then echo $file fi done) 2>/dev/null
Replace gnulibc1/lib-compat with the directory you store your libc5 shared objects in.