VMTK extension build error

[jamesobutler (James Butler)]

See the following thread where @chir.set needs to finalize compatibility with VTK 9.4.

SlicerVMTK not building for SlicerPreview on cdash

SlicerVMTK is not building on cdash for SlicerPreview while it does build for SlicerStable. The error messages relate to the VMTK library itself. FYI, hoping for an investigation.