lablgtk2 -> lablgtk transition.

[Sven Luther <sven.luther@wanadoo.fr>]

Hello, 

Altough it is still unanounced, lablgtk upstream has released lablgtk
2.4.0. I don't know what that means with regard to lablgtk1
compatibility, but i will probably have the lablgtk package be this new
lablgtk2 descendent, and provide a lablgtk1 package for backward
compatibility.

Friendly,

Sven Luther