Fix to make sqlpp11 compile with clang-3.1
Fix to make sqlpp11 compile with clang-3.1

rettichschnidi/sqlpp11,sergeken/sqlpp11,happybits/sqlpp11,rbock/sqlpp11,coldzhang/sqlpp11,sergeken/sqlpp11,rbock/sqlpp-concepts-experiments,sergeken/sqlpp11,sergeken/sqlpp11,happybits/sqlpp11,volka/sqlpp11,volka/sqlpp11,rettichschnidi/sqlpp11,rbock/sqlpp-concepts-experiments,rbock/sqlpp11,rbock/sqlpp11,volka/sqlpp11,coldzhang/sqlpp11,coldzhang/sqlpp11,happybits/sqlpp11,rettichschnidi/sqlpp11,happybits/sqlpp11,rbock/sqlpp-concepts-experiments,rettichschnidi/sqlpp11,volka/sqlpp11,rbock/sqlpp11