Increasing CMake requirement

[Dan Leinir Turthra Jensen]

Hi all!

  Just opened an MR[1] which aims to fix the GSL error on Windows (which 
you'll have noticed if you've looked at the build factory recently), and the 
most sensible way to fix that is to not use a home grown find module, but 
rather use the one shipped with CMake. However, Calligra requires CMake 
2.8.something and that module has only been in CMake since 3.2. Now, 3.2 has 
been out for quite a while time now, and it seems unlikely to be controversial 
to increase it to that, but also i don't want to just do it, so... if people 
could weigh in, that'd be neat :)

[1] https://invent.kde.org/office/calligra/-/merge_requests/33

-- 
..dan / leinir..
http://leinir.dk/