Boolean pixel values are no longer supported in VTK 9.2.

diff --git a/addons/vtk/test_vtkimage.cc b/addons/vtk/test_vtkimage.cc
--- a/addons/vtk/test_vtkimage.cc
+++ b/addons/vtk/test_vtkimage.cc
@@ -206,7 +206,7 @@ BOOST_AUTO_TEST_CASE_TEMPLATE( test_mhd_write_read, T, type_mhd )
        unlink(zrawfilename.str().c_str());
 }
 
-#if  VTK_MAJOR_VERSION >= 7
+#if  VTK_MAJOR_VERSION >= 7 && VTK_MAJOR_VERSION < 9
 BOOST_AUTO_TEST_CASE( test_simple_write_read_bool )
 {
        C3DBounds size(2, 3, 4);
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<tr><td><span title='2020-06-09 20:01:09 +0200'>2020-06-09</span></td><td><a href='/guix/commit/gnu/packages/pep.scm?id=3cf7088fc646e07158914dea1314151123472ec2'>gnu: Add java-pep-adapter.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pep.scm (java-pep-adapter): New variable.
</span></span></td><td>Hartmut Goebel</td></tr>
<tr><td><span title='2020-06-09 20:01:09 +0200'>2020-06-09</span></td><td><a href='/guix/commit/gnu/packages/pep.scm?id=9b72216630b3ba53eca1ca8031476c99c3579f34'>gnu: Add python-pep-adapter.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pep.scm (python-pep-adapter): New variable.
</span></span></td><td>Hartmut Goebel</td></tr>
<tr><td><span title='2020-06-09 20:01:08 +0200'>2020-06-09</span></td><td><a href='/guix/commit/gnu/packages/pep.scm?id=cfd15d96e612d0017da2f8e515da7af1ebd65231'>gnu: Add libpepadapter.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pep.scm (libpepadapter): New variable.
</span></span></td><td>Hartmut Goebel</td></tr>
<tr><td><span title='2020-06-09 20:01:08 +0200'>2020-06-09</span></td><td><a href='/guix/commit/gnu/packages/pep.scm?id=221c514451917caa98060cdb285454bacfc25014'>gnu: Add pep-engine.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pep.scm (fdik-libetpan, sequoia4pEp, pep-engine): New
  variables.
</span></span></td><td>Hartmut Goebel</td></tr>
<tr><td><span title='2020-06-09 20:01:08 +0200'>2020-06-09</span></td><td><a href='/guix/commit/gnu/packages/pep.scm?id=d7a341f8e186279a6be11fbc25c5347d6925145f'>gnu: Add yml2.</a><span class='msg-avail'>...<span class='msg-tooltip'>* gnu/packages/pep.scm: New file.
* gnu/locak.mk (GNU_SYSTEM_MODULES): Add it.
</span></span></td><td>Hartmut Goebel</td></tr>