Add bcond for OBS-specific quirks
    
    The version substitution system is not able to fully subst
    the current Version field due to the inline use of macros, so you end up with like:
      257-123-gabcd257.1
    instead of:
      257-123-gabcd
    
    I.e., the hard-coded 257.1 gets appended to the OBS-specified version.
    
    If it was simply hardcoded as 257.1 it would work, but the inline
    macros throw it off.
    
    [skip changelog]