On the native linux target the net package defaulted to a NOP netdev that
returns "Netdev not set" for every operation, so net.Dial/Listen, DNS and
anything built on them (net/http, tls) failed at runtime.
Native linux does not override the syscall package, and the TinyGo compiler
lowers syscall.Syscall/RawSyscall into real system calls, so the standard
library socket functions work directly (musl's omitted network module is not
needed). Register a default netdev implementing the netdever interface on top
of syscall.Socket/Connect/Bind/Listen/Accept/Send/Recv/SetSockOpt, plus a
small UDP DNS resolver (/etc/hosts, /etc/resolv.conf) for GetHostByName. Also
restore the net.DNSError type used by resolution errors.
Blocking sockets under the threads scheduler; IPv4 only. This avoids the
internal/poll netpoller dependency that blocked the upstream-net approach.
Refs tinygo-org/net#28
Moses Narrow