Bug#964127: plplot: Please switch from sip4 to sip5

[Rafael Laboissière]

A further comment on my last message:

* Rafael Laboissière <rafael at debian.org> [2020-11-29 13:40]:

> Building in a clean unstable chroot fails with this error message:
>
>  cd <build_dir>/obj-x86_64-linux-gnu/bindings/qt_gui/pyqt5 && /usr/bin/sip5 -c . -I/usr/lib/python3/dist-packages/PyQt5/bindings -n PyQt5.sip -t Qt_5_15_0 -t WS_X11 <build_dir>/bindings/qt_gui/pyqt5/plplot_pyqt5.sip
>  sip5: /usr/lib/python3/dist-packages/PyQt5/bindings/QtCore/QtCoremod.sip:25: At most one of this %Timeline must be specified with the -t flag

The following succeeds:

  cd <build_dir>/obj-x86_64-linux-gnu/bindings/qt_gui/pyqt5 && /usr/bin/sip5 -c . -I/usr/lib/python3/dist-packages/PyQt5/bindings -n PyQt5.sip -t Qt_5_14_0 -t WS_X11 <build_dir>/bindings/qt_gui/pyqt5/plplot_pyqt5.sip

I only changed “-t Qt_5_15_0” to “-t Qt_5_14_0”.  It looks like there is 
something hardcoding my build above to Qt version 5.14.

Best,

Rafael Laboissière