* fhandler_netdrive.cc (struct netdriveinf): New structure to
store thread arguments.
(thread_netdrive): Thread handling all potentially blocking
WNet... calls.
(create_thread_and_wait): Start and wait for above thread.
(fhandler_netdrive::exists): Change to call create_thread_and_wait
instead of calling WNet... function.
(fhandler_netdrive::readdir): Ditto. Fix error handling.
(fhandler_netdrive::rewinddir): New method.
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