[poppler] Poppler 0.15.2 delayed

[Albert Astals Cid]

So poppler 0.15.2 was supposed to be released today/tomorrow 3rd of November 
but the two main features that were work in progress

 * Add antialiasing to the splash backend shadings
 * Linearization

are still not merged though quite close to completion so i think it makes 
sense to delay it until we get them in.

Besides that i think we have Matthias patch for Qt4/Arthur and Benjamin patch 
for Box cropping that should also go in before 0.15.2 as this is the last 
release that will accept new features for 0.16.0

Anything i'm missing?

Albert