[update] update to upstream commit c4254a0
Squashed 'qtgraphicaleffects/' changes from bd434a6..535c697

535c697 sync.profile: Point dependencies to an empty string
d4ff8be Add changes-5.1.0 file

git-subtree-dir: qtgraphicaleffects
git-subtree-split: 535c6978fdb11b58ba65873d0105b5e90219c5de
Merge commit 'bade8c7b169305219630aa211fbc4bc78a2ce969'
[packaging] touch .git to make sure that syncqt is run

Signed-off-by: Carsten Munk <carsten.munk@jollamobile.com>