The 'headersclean' flag is not a "feature" anymore, so qtbase doesn't
propagate it for other repositories. CI no need to set either
INPUT_headersclean=ON or add -headersclean flag to the
qt-configure-module script command line.
Task-number: QTBUG-121722
Change-Id: I6970d6a04dd51ad4d3df114212f6410b80ddc6a1
Reviewed-by: Joerg Bornemann <joerg.bornemann@qt.io>