Remove unnecessary exports.
Remove unnecessary exports.

libmetrocoin/libmetrocoin-explorer,tuomassiren/libbitcoin-explorer,GroestlCoin/libgroestlcoin-explorer,GroestlCoin/libgroestlcoin-explorer,libtetcoin/libtetcoin-explorer,libmetrocoin/libmetrocoin-explorer,cancoin/libbitcoin-explorer,tuomassiren/libbitcoin-explorer,libtetcoin/libtetcoin-explorer,GroestlCoin/libgroestlcoin-explorer,cancoin/libbitcoin-explorer