Need to encode the fd type in the NSPR_INHERIT_FDS environment string, so that in the child process we know whether it is a file, TCP socket, or UDP socket.
Need to encode the fd type in the NSPR_INHERIT_FDS environment string,
so that in the child process we know whether it is a file, TCP socket,
or UDP socket.

makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub