bc93aaa changes for ghc-8.2: _ghcdynlibdir, drop ghc_without_shared, chrpath

Authored and Committed by petersen 6 years ago
    changes for ghc-8.2: _ghcdynlibdir, drop ghc_without_shared, chrpath
    
    - add _ghcdynlibdir for Cabal --dynlibdir
    - dynlibs in _libdir except ghc's libs
    - drop ghc_without_shared
    - ghc_fix_rpath removes RPATHs for 8.2+
    
        
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