[krbdev.mit.edu #1242] mainline util/reconf does not work on debian

[Ken Raeburn via RT]

There are a couple issues with assumptions we make about the autoreconf
script that could be cleaned up (1: it's a /bin/sh script and not perl;
2: it doesn't care if it's name is not precisely "autoreconf") to make
debian's autoreconf happier, but the --localdir/--include argument
breakage is something we cannot easily work around.  It's a Debian bug.

(I've tweaked the ticket subject to indicate it's on Debian only.  I'm
not aware of other systems shipping similarly hacked autoconf, but that
doesn't mean they're not out there....)