Revisions of qwt6

Wolfgang Engel's avatar Wolfgang Engel (bigironman) accepted request 884862 from Luigi Baldoni's avatar Luigi Baldoni (alois) (revision 3)
Update to version 6.1.6
Yuchen Lin's avatar Yuchen Lin (maxlin_factory) accepted request 854468 from Antonio Larrosa's avatar Antonio Larrosa (alarrosa) (revision 2)
Update qwt6 so it doesn't depend on Qt4 which will be removed soon (boo#1179613)

- Update to 6.1.5:
  * Avoid using some of the deprecated Qt APIs
  * Missing includes of QPainterPath ( Qt 5.15 ) added
  * QwtPlotSpectroCurve: missing public inheritance
  * QwtPlotTradingCurve: missing public inheritance
  * QwtLinearColorMap: handling of alpha values in color stops fixed
  * QwtPlotRasterItem: Fixed missing color table initialization for
    QImage::Format_Indexed8
  * QwtScaleWidget: missing QEvent::LayoutRequest added
  * QwtSetSample: bound rectangle fixed for empty sets

- Fix build with recent libqt5-qttools packages.

- Fixed conflict with Qwt 5.
- Fix requires for -devel package

- Build against Qt5 by default
- Dropped qwt-qt5.patch

- Update to version 6.1.4
  * All widgets ( including plot canvas )
    + missing initialization of the background color hint, when
      drawing a styled focus rectangle
    + devicePixelRatio handling adjusted, QT_SCALE_FACTOR supported
  * Maintenance
    + deprecated QString::null replaced by QString()
    + making clang-tidy/clazy and friends happier
    + compiler warnings with newer Qt versions fixed
  * PyQt-Qwt
    + specific defines added
Wolfgang Engel's avatar Wolfgang Engel (bigironman) committed (revision 1)
osc copypac from project:openSUSE:Leap:15.2 package:qwt6 revision:11, using expand
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