use qt 5.2
use qt 5.2

1. An issue with resource_timeout is less severe in Qt 5.2;
2. Qt 5.2 was used anyways because of python-pyqt5 package which depends
   on Qt 5.2 (Qt 5.4.1 was unused and just took extra space).

pombredanne/splash,pawelmhm/splash,pawelmhm/splash,Youwotma/splash,pombredanne/splash,pombredanne/splash,pawelmhm/splash,Youwotma/splash,Youwotma/splash