[qmf] Update to upstream version 4.0.1.
Squashed 'qmf/' changes from 9fd25ba..696f60b

696f60b Fix QMF with Qt 5.1+

git-subtree-dir: qmf
git-subtree-split: 696f60b3b3e13a244cb1ae91e836e4db6c766b21
Merge commit '6addc529ff2b04d12d82dcf2701aae71748e3461'