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Ken Brown e67679fcac Cygwin: define fhandler_fifo::fstat
Previously fstat on a FIFO would call fhandler_base::fstat.

The latter is not appropriate if fhandler_fifo::open has already been
called (and O_PATH is not set), for the following reason.  If a FIFO
has been opened as a writer or duplexer, then it has an io_handle that
is a pipe handle rather than a file handle.  fhandler_base::fstat will
use this handle and potentially return incorrect results.  If the FIFO
has been opened as a reader, then it has no io_handle, and a call to
fhandler_base::fstat will lead to a call to fhandler_base::open.
Opening the fhandler a second time can change it in undesired ways;
for example, it can modify the flags and status_flags.

The new fhandler_fifo::fstat avoids these problems by creating an
fhandler_disk_file and calling its fstat method in case
fhandler_fifo::open has already been called and O_PATH is not set.
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