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* errno.cc (errmap): Handle ERROR_IO_PENDING.
* fhandler.cc (fhandler_base::open): Make tape I/O asynchronous.
* fhandler.h (class fhandler_dev_tape): Add mt_evt member.
* fhandler_tape.cc (mtinfo_drive::initialize): Initialize async_writes.
(mtinfo_drive::close): Handle async writes.
(mtinfo_drive::read): Add mt_evt parameter. Use overlapped I/O.
(mtinfo_drive::async_wait): New function.
(mtinfo_drive::write): Add mt_evt parameter. Use overlapped I/O.
Handle async writes.
(mtinfo_drive::_set_pos): Handle async writes.
(mtinfo_drive::set_partition): Ditto.
(mtinfo_drive::prepare): Ditto.
(mtinfo_drive::get_status): Drop useless "else". Handle async_writes
flag.
(mtinfo_drive::set_options): Handle async_writes flags.
(fhandler_dev_tape::close): Close mt_evt handle.
(fhandler_dev_tape::raw_read): Create mt_evt handle and use in call
to mtinfo_drive::read.
(fhandler_dev_tape::raw_write): Create mt_evt handle and use in call
to mtinfo_drive::write.
* mtinfo.h (MTINFO_VERSION): Bump.
(enum dirty_state): Add async_write_pending state.
(class mtinfo_drive): Add OVERLAPPED struct "ov". Add async_writes
flag.
(mtinfo_drive::async_wait): Add declaration.
(mtinfo_drive::read): Add mt_evt parameter.
(mtinfo_drive::write): Ditto.
* registry.cc (load_registry_hive): Call enable_restore_privilege
instead of set_process_privilege.