package/python-pyqt5: manage qt optional dependencies

package/python-pyqt5: manage qt optional dependencies

Explictly enable the needed pyqt5 modules depending on Qt5 options or
packages

QtQuick moodule can't be built without opengl support so enable only
when OpenGL is available

Fixes:
 - https://bugs.buildroot.org/show_bug.cgi?id=12121
 - http://autobuild.buildroot.org/results/cb69c5daa564aa9f3250faa395399cb00a445e85

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Reviewed-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>