OpenCascade 7.3 deprecates some TK libraries that were not required by
KiCad, therefore we should not include them in the compile.
Also correct missing compiles for STEP import/export induced by 584409b2e when using OCCT. There is no effect on OCE to this change.
This tool is currently very rudimentary. I pushed it because I need to
collect responses from it from users with diverse graphics
configurations, so I want the tool to be in the nightly builds.
This affects no KiCad code.