cmb: drop smtkusersguide dep for now

Documentation generation isn't working.

(cherry picked from commit 05d69d9b)

projects/cmb.cmake

@@ -37,7 +37,8 @@ superbuild_add_project(cmb
   DEFAULT_ON
   INDEPENDENT_STEP_TARGETS ${cmb_lfs_steps} download update
   DEPENDS boost moab remus vxl nlohmannjson python paraview pybind11
-          qt qt5 smtk zeromq cmbworkflows cmbusersguide smtkusersguide
+          #qt qt5 smtk zeromq cmbworkflows cmbusersguide smtkusersguide
+          qt qt5 smtk zeromq cmbworkflows cmbusersguide
   DEPENDS_OPTIONAL cumulus ${cmb_extra_optional_dependencies}
                    cxx11 gdal hdf5 netcdf opencv
   CMAKE_ARGS