Bug#32283: xbase postinst refers to nonexistent README.Debian

[Peter Maydell <maydell@tao.co.uk>]

Branden Robinson wrote:
>The package does ship with the file in question.
>
>I don't have the first clue why dpkg isn't installing it.

Update: doing dpkg -i xbase_3.3.2.3a-8.1.deb again caused the 
file to be installed this time round...
I don't suppose it's going to be possible to figure out what occurred
here without any information; I'll try to remember to log debug info
from dpkg when I upgrade my other machine, in case the problem
occurs there too.

Peter Maydell