Build the python3 bindings and add a subpackage for them.
    
    - Remove the CMakeLists patch file in favor of built-in CMake python
      library search configuration, which also allows building for both
      python3 and python2.
    - Add missing requires to -devel on the python bindings to ensure the
      included examples can be ran.
    - Do not include byte-compiled files for python scripts.