Changelog ([1]):
1) Maintenance
- QwtPlotLayout::activate: avoid compiler issues with Qt 5.15
- QwtPointPolar: missing copy constructor added
[1] https://sourceforge.net/p/qwt/code/HEAD/tree/tags/qwt-6.1.6/CHANGES-6.1
Signed-off-by: Peter Seiderer <ps.report@gmx.net>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>