Revert "cmake: Fix install path for QtQuick2 library"
Revert "cmake: Fix install path for QtQuick2 library"

This reverts commit 93a489d29422cf15781239931919aa6d13b5c7c9,
which is wrong because QtQuick1 stuff are also installed when
built against Qt5 and therefore the QTQUICK1_INSTALL_DIR must
exist and it should be the imports dir. QTQUICK2_INSTALL_DIR
is a different thing.

nasserGanjali/QtGStreamer,iperry/qt-gstreamer,tswindell/qt-gstreamer,nasserGanjali/QtGStreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,detrout/qt-gstreamer,nasserGanjali/QtGStreamer,knuesel/qt-gstreamer,dejunk/gstreamer,iperry/qt-gstreamer,knuesel/qt-gstreamer,dejunk/gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,GStreamer/qt-gstreamer,knuesel/qt-gstreamer,GStreamer/qt-gstreamer,freedesktop-unofficial-mirror/gstreamer__qt-gstreamer,tswindell/qt-gstreamer,detrout/qt-gstreamer,iperry/qt-gstreamer,tswindell/qt-gstreamer,detrout/qt-gstreamer,GStreamer/qt-gstreamer,dejunk/gstreamer