c624568 split ghc.attr into ghc_lib.attr and ghc_bin.attr; require ghc-compiler

Authored and Committed by petersen 9 years ago
    split ghc.attr into ghc_lib.attr and ghc_bin.attr; require ghc-compiler
    
    - allows handling executables more precisely and not assume bindir
    - avoid "ghc: command not found" error when ghc wasn't installed
    
        
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