Workaround generic lambda (C++14) limitation and remove guard.
Workaround generic lambda (C++14) limitation and remove guard.

kaostao/sx,GroestlCoin/libgroestlcoin-explorer,cancoin/libbitcoin-explorer,libtetcoin/libtetcoin-explorer,libmetrocoin/libmetrocoin-explorer,libtetcoin/libtetcoin-explorer,GroestlCoin/libgroestlcoin-explorer,libmetrocoin/libmetrocoin-explorer,BWallet/sx,tuomassiren/libbitcoin-explorer,kaostao/sx,BWallet/sx,BWallet/sx,tuomassiren/libbitcoin-explorer,GroestlCoin/libgroestlcoin-explorer,kaostao/sx,cancoin/libbitcoin-explorer