test_mem_leaks.sh: use libtool to invoke check_mem_leaks
test_mem_leaks.sh: use libtool to invoke check_mem_leaks

The libtool documentation says the proper way to invoke the
compiled program before it is installed is to use libtool.

git-svn-id: ae38cf1093b87151f738d2b2220cac7742ad2e55@911 64e312b2-a51f-0410-8e61-82d0ca0eb02a

lubosz/check,lubosz/check,lubosz/check,lubosz/check