Why do I need a bunch of mappings for ld-elf.so in FreeBSD 8?

[Paul Hoffman]

Greetings. I upgraded a 7.2 system to 8.0 using 'freebsd-update install'. At some time during the process, I could no longer log in remotely because bash could not start due to /libexec/ld-elf.so not finding the right libraries. I added a bunch of lines to /etc/libmap.conf so that I could continue, and did a full 'portupgrade -af'. 'freebsd-update fetch' reports nothing to fetch, but I can't remove the lines from /etc/libmap.conf.

How do I get a /libexec/ld-elf.so that has up-to-date mappings internal to it?

FWIW:
-r-xr-xr-x  1 root  wheel  220788 Dec  7 08:41 /libexec/ld-elf.so.1