Platform-python bootstrap: step 1 - build without platform_python
    
    Changes needed for Platform Python Stack change (https://fedoraproject.org/wiki/Changes/Platform_Python_Stack):
    - Add platform-python bytecompilation patch: platform-python-bytecompile.patch
    - Add platform python deps generator patch: platform-python-abi.patch
    - Add a platform-python subpackage and remove system python related declarations
    - Build rpm without platform_python for bytecompilation (already set in spec file)
    
    When platform-python package is built, switch to `%bcond_without platform_python`
    to build platform-python-rpm subpackage.