serial_flush() implements FlushFileBuffers for serial devices wrongly

[Wolfgang Walter]

Hello,

FlushFileBuffers should write out any data not yet transmitted but
serial_flush() instead discards any data not yet transmitted

This is because it uses tcflush() instead of tcdrain().

Call tcdrain for serial handles directly from NtFlushBuffersFile()
and remove serial_flush() in server/serial.c


-- 
Wolfgang Walter
Studentenwerk München
Anstalt des öffentlichen Rechts
Leiter EDV
Leopoldstraße 15
80802 München
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