stable libc6-dev update

[Richard Kettlewell <rjk@greenend.org.uk>]

While helping my girlfriend to bring her system up to date, we
encountered a problem which is best summarized as:

lyonesse$ wget -q -O - http://security.debian.org/dists/stable/updates/main/binary-i386/libc6-dev_2.1.3-20_i386.deb | md5sum
f470ae87d6c06b84c40cf9411c7b93e6
lyonesse$ wget -q -O - http://security.debian.org/dists/potato/updates/main/binary-i386/libc6-dev_2.1.3-20_i386.deb | md5sum
9ffd0b4c6a15f0cc0f95bcb895f2685b
lyonesse$ 

Note the differing hashes; the only difference in the URLs is the
substituion of "potato" for "stable" (one that apt appears to be
making automatically, hence our noticing).

Our ISP has a "transparent" web cache, so it may well be a purely
local problem.  So does anyone who isn't using NTL else see this?

ttfn/rjk