75b2f24 Allow adding "extra packages" in package-notes.txt

Authored and Committed by Owen W. Taylor 6 years ago
    Allow adding "extra packages" in package-notes.txt
    
    Add flags EB/EB_SDK/E/E_SDK for marking a package as an "extra package" -
    something that we want in the runtime even though it isn't in the upstream
    runtimes.
    
        
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