cmake: workaround for qtcreator bug

6 jobs for qtcreator-workaround in 82 minutes and 29 seconds (queued for 1 second)
Status Job ID Name Coverage
  Test
passed #13672
Qt551 VS2013
VS2013-Qt-5.5.1-x64

00:15:21

passed #13671
Qt56 VS2015
VS2015-Qt-5.6.0-x32

00:17:21

passed #13670
Qt56 VS2015
VS2015-Qt-5.6.0-x64

00:21:36

passed #13668
MultiThreads Linux
clang-c++11-Qt5

00:08:54

passed #13669
MultiThreads Linux
cppcheck

00:38:59

passed #13667
Linux
gcc-c++11-Qt5

00:03:55