* dtable.cc (dtable::dup2): Add some debugging. Use methods from passed in

* dtable.cc (dtable::dup2): Add some debugging.  Use methods from passed in
class rather than cygheap->fdtab.
* fhandler_socket.cc (fhandler_socket::fixup_before_fork_exec): Add more
debugging output.
(fhandler_socket::dup): Allocate new space for prot_info_ptr for duplicated
entry.
* syscalls.cc (stat_worker): Always delete fh if it has been created.