638ba27 Fix literal % handling in %{pyproject_files} on RPM 4.19

Authored and Committed by churchyard a year ago
    Fix literal % handling in %{pyproject_files} on RPM 4.19
    
    RPM 4.19 now requires 2 %s to escape a single literal % in the filelist.
    
    The test has been adjusted to actually run our code
    instead of only verifying the assumptions.
    
        
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