Bug#1027965: Add libvtk6-qt-dev to dependencies

[Mathieu Malaterre]

Control: tags -1 patch

Since 2016 it seems that a hack has been put in place in vtk package
consumer to always include vtk-qt package:

https://salsa.debian.org/med-team/vtk-dicom/-/commit/0d3fde678cd86459a485df7492307b94a5afc97e

I suspect it would be better done in vtk9 package itself.

Typical patch would be:

 % git diff
diff --git a/debian/control b/debian/control
index 5d7b4d36..38fda9b3 100644
--- a/debian/control
+++ b/debian/control
@@ -88,6 +88,7 @@ Package: libvtk9-dev
 Architecture: any
 Section: libdevel
 Depends: ${misc:Depends},
+         libvtk9-qt-dev (= ${binary:Version}),
          ${shlibs:Depends},
          default-jdk [!hppa !hurd-any !kfreebsd-any],
          default-libmysqlclient-dev,