use new CMake macros (the transitional -B. hack no longer works)
    
    * Wed Jul 20 2022 Kevin Kofler <Kevin@tigcc.ticalc.org> - 3.2.0-3
    - use new CMake macros (the transitional -B. hack no longer works)
    
    Presumably, changing .. to -S.. would make it work, but that would break
    compatibility with ancient CMake just as using the new macros does, so
    we may as well do the right thing and drop the legacy junk.