python2-pyqt4: don't install Python3 uic port

It only gives us trouble because 'freezing' an application will choke on
those files. Also, it doesn't make sense to install them since this is a
Python2 package.
Merge pull request #82 from saghul/pyqt4-uic-port3

python2-pyqt4: don't install Python3 uic port