86aae6 Enable RPM to set SOURCE_DATE_EPOCH environment variable.

Authored and Committed by vondruch a year ago
    Enable RPM to set SOURCE_DATE_EPOCH environment variable.
    
    If %source_date_epoch_from_changelog is true, RPM can set the SOURCE_DATE_EPOCH
    environment variable to the timestamp of the topmost changelog entry. The
    SOURCE_DATE_EPOCH can be in turn used by various projects to override otherwise
    dynamically generated timestamps.
    
    E.g. this might help to have stable timestamps in generated
    documentation etc.
    
        
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