Two identically-named libtool directories

[Christopher Faylor]

We have two libtool directories with two setup.hints in
~release/_obsolete and ~release.  This is causing problems.  It seems
like things have been like this since at least November and no one was
complaining because upset threw out the _obsolete package in favor of a
newer one thanks purely to the fragile sort order directory inspection.
That has changed now thanks to last week's problems.

People are complaining about getting out-of-date versions of libtool.
Maybe I'll figure out the intent two seconds after sending this message
but I can't see any reason to have two packages with identical names in
the release so I have deleted the _obsolete/libtool packages.

Looks like even error-checking for upset is in order.

cgf