COMP: Fix configuration by expecting phonon Qt component only on windows

This commit fix configuration issue introduced by r22756

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22757 3bd1e089-480b-0410-8dfb-8563597acbee
COMP: Remove CMake code that was updating now unused QTLIBLIST variable

Following commit r22756, the use of QTLIBLIST has been superseded by
the Slicer_REQUIRED_QT_MODULES variable.

git-svn-id: http://svn.slicer.org/Slicer4/trunk@22758 3bd1e089-480b-0410-8dfb-8563597acbee