8a8de3a new cabal_tweak_dep_ver macro for tweaking versions of depends

Authored and Committed by petersen 11 years ago
    new cabal_tweak_dep_ver macro for tweaking versions of depends
    
    %cabal_tweak_dep_ver dep old new [backup]
    changes old version bound to new for dep with optional backup suffix
    
    eg %cabal_tweak_dep_ver haskell-src-exts 1.12 1.14 2
    
        
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