Fix error about missing qtsolutions/config.pri with Qt 5

I had an error about missing qtsolutions/config.pri when calling qmake on my new laptop with Qt5 on Ubuntu 14.04 x64
I don't know how it should be solved properly with Qt5, below I found a solution that works:
https://qt.gitorious.org/qt-solutions/ov3r1oads-qt-solutions/commit/8c2c3f0bde67e64c627c903b718bec92ace28680?diffmode=sidebyside

Goldencheetah works great for me, thanks!