Remove most KDELibs4Support linking
Review Request #127021 - Created Feb. 9, 2016 and submitted
|Aleix Pol Gonzalez|
Drops KDELibs4Support usage, mostly it wasn't actually used, except for that KFileDialog usage that I ported.
Opening dialog seems to work fine, tests still pass except for parttest, but I'm unsure it's related: https://paste.kde.org/p37pdubgf