Cygwin: split out fhandler_socket into inet and local classes
First cut, still incomplete * fhandler_socket is now base class for other socket classes * fhandler_socket_inet handles AF_INET and AF_INET6 sockets * fhandler_socket_local handles AF_LOCAL/AF_UNIX sockets * finally get rid of fdsock by using set_socket_handle in accept4 * align file-related calls (fstat, fstatvfs, fchown, fchmod, facl) to Linux. Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
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