Packet driver networking updates:
- Use PF_PACKET/SOCK_RAW sockets instead of the deprecated and buggy
AF_INET/SOCK_PACKET ones, changed the interfaces accordingly.
- Put the sockets in a bind state - this allows to use the Async IO,
which makes the direct NIC access mode ~50x faster.
- Use simple read/write for IO - this is possible with the binded
RAW sockets (not with the PACKET sockets though - they insist on
sendto() even when binded, which is a bug).
- Some large cleanups.


git-svn-id: https://dosemu.svn.sourceforge.net/svnroot/dosemu/trunk@715 7758b857-130e-0410-ab9c-d8735a528d18