Since getpass() has been dropped from POSIX and is now considered unsafe, I've decided to remove all detection of it. I've reworked the implementation of lutil_getpass() which is used instead, when getpassphrase() is not present. In addition to streamlining the code, I've removed the Merit-specific use of telnet control codes, since that was specifically for a long obsolete deployment at UMich (most likely the old ud client which was deleted from the OpenLDAP tree years ago).