Building vtkioss fails due to undefined references to pthread library

Paraview version: 5.9.0
System: Linux x86_64 (openSUSE Tumbleweed)

When building paraview, we see errors when compiling vtkioss due to the pthread library not being linked explicitly. This may be due to openSUSE linker flags using -Wl,--no-undefined by default. We need the following patch to get vtkioss linking properly to pthread:

Index: ParaView-v5.9.0/VTK/ThirdParty/ioss/vtkioss/CMakeLists.txt
===================================================================
--- ParaView-v5.9.0.orig/VTK/ThirdParty/ioss/vtkioss/CMakeLists.txt
+++ ParaView-v5.9.0/VTK/ThirdParty/ioss/vtkioss/CMakeLists.txt
@@ -231,6 +231,8 @@ list(APPEND headers
 
   vtk_ioss_mangle.h)
 
+vtk_module_find_package(PACKAGE Threads)
+
 vtk_module_add_module(VTK::ioss
   SOURCES ${sources}
   PRIVATE_HEADERS ${headers})
@@ -238,3 +240,7 @@ vtk_module_definitions(VTK::ioss
   PRIVATE
     NO_ZOLTAN_SUPPORT
     NO_PARMETIS_SUPPORT)
+vtk_module_link(VTK::ioss
+  PRIVATE
+    Threads::Threads)
+

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