Bug#468908: fix build-dependency

[Thomas Viehmann]

Package: donkey-bolonkey
Version: 2001-4
Severity: important

Hi,

donkey-bolonkey build-depends on liballegro-dev.
I might be better if it build-depended on liballegro4.2-dev instead.
liballegro4.2-dev also provides liballegro-dev, but the latter is  
also a package from allegro4.1 and you would not want to build  
against that. (It is about to be removed, for that matter.)

Kind regards

T.