Updating CMake requirement to 2.8.12 RC 1

[David Faure]

On Friday 23 August 2013 06:51:23 Martin Graesslin wrote:
> Given that it's already lots of work to keep up with the constant breakage
> due  to changes in frameworks the outlook of also having breakage in cmake
> is nothing I look forward to.

FWIW, I've been using cmake master for many years, and I can't even remember 
*ONE* breakage.

But anyway, I'm fine with not requiring git master, since the thread showed 
that it's not convenient for everyone.

I just wanted to refute the argument about "breakages" :)

-- 
David Faure, faure at kde.org, http://www.davidfaure.fr
Working on KDE, in particular KDE Frameworks 5