getaddrinfo cannot be statically linked if glibc is used

For easy deployment of network programs in Haskell, it would be nice if all libraries were statically linked. Golang does this well as we know.

Unfortunately, it appeared that `getaddrinfo` in `glibc` has to be always dynamically linked due to `libnss`. Now we have the `dns` library, I would like to implement `getAddrInfo` purely in Haskell.