f70ac59 Revert back to 0.28

Authored and Committed by pwalter 4 years ago
    Revert back to 0.28
    
    libgit2 0.99 got negative karma in Bodhi and got unpushed. Revert back to
    libgit2 0.28 ABI to avoid violating the Stable Updates Policy.
    
        
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