remove useless Requires(post)
    
    RPM guarantees that all requires will be installed before this package
    and Requires(post) is needed in 2 cases:
    
    * When you don't need it in Requires (not the case at all)
    * When you have dependency loops and you need to give hint what
      to install first (not the case for crypto-policies)
    
    Signed-off-by: Igor Gnatenko <ignatenko@redhat.com>