Widgets were ported away from QtOpenGL in 5.15.0 but bogus dependency
remained: https://bugreports.qt.io/browse/QTBUG-81902

--- a/src/multimediawidgets/multimediawidgets.pro
+++ b/src/multimediawidgets/multimediawidgets.pro
@@ -2,8 +2,6 @@
 TARGET = QtMultimediaWidgets
 QT = core gui multimedia widgets-private
 QT_PRIVATE += multimedia-private
-qtHaveModule(opengl): \
-   QT_PRIVATE += opengl
 
 PRIVATE_HEADERS += \
     qvideowidget_p.h \