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='2021-05-10 22:34:43 -0400'>2021-05-10</span></td><td><a href='/guix/commit/po/doc/guix-manual.zh_CN.po?id=21fcced608c93e1ac836cdd9ab8c5d200c667e75'>nls: Update translations.</a></td><td>Maxim Cournoyer</td></tr>
<tr><td><span title='2021-04-18 13:18:02 +0200'>2021-04-18</span></td><td><a href='/guix/commit/po/doc/guix-manual.zh_CN.po?id=5d1f110b454b9de30a8dde8d51a213bb956d54f3'>nls: Update 'zh_CN' translations.</a></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-05-15 16:36:21 +0200'>2019-05-15</span></td><td><a href='/guix/commit/po/doc/guix-manual.zh_CN.po?id=32747aa987bd921bc8aadc1c1d4b4da6d9bcc306'>nls: Update 'zh_CN' translation.</a></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-27 10:42:15 +0200'>2019-04-27</span></td><td><a href='/guix/commit/po/doc/guix-manual.zh_CN.po?id=615b147f3a1234f801e3138c47d821cb820257b8'>nls: Fix wrong include name.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/doc/guix-manual.zh_CN.po: Fix wrong include name.
</span></span></td><td>Clément Lassieur</td></tr>
<tr><td><span title='2019-04-27 00:02:15 +0200'>2019-04-27</span></td><td><a href='/guix/commit/po/doc/guix-manual.zh_CN.po?id=cdb57a831c0f778c2d856b92f875b54b91afadd7'>nls: Update 'zh_CN' translation.</a><span class='msg-avail'>...<span class='msg-tooltip'>Refer to the right version.*.texi to prevent errors in Makefile.am.
</span></span></td><td>Julien Lepiller</td></tr>
<tr><td><span title='2019-04-24 00:24:07 +0200'>2019-04-24</span></td><td><a href='/guix/commit/po/doc/guix-manual.zh_CN.po?id=3068509ac12df6f2fc6e500019a4d8bbf75d32a2'>nls: Fix guix-manual.zh_CN.po.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/doc/guix-manual.zh_CN.po: Replace "@def" with "@dfn".  Translate
the "contributing.texi" message ID.
</span></span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2019-04-24 00:17:15 +0200'>2019-04-24</span></td><td><a href='/guix/commit/po/doc/guix-manual.zh_CN.po?id=544cab3dccb5ee8c0b691c173546a26f0e25625a'>doc: Add zh_CN PO file.</a><span class='msg-avail'>...<span class='msg-tooltip'>* po/doc/guix-manual.zh_CN.po: New file.
</span></span></td><td>Ludovic Courtès</td></tr>