implemented IOCTL purge for serial objects.

[Eric Pouech]

ChangeLog:
- implemented IOCTL purge for serial objects
- moved kernel32!PurgeComm on top of it

  dlls/kernel/comm.c  |   34 ++++++++--------------------------
  dlls/ntdll/serial.c |   20 ++++++++++++++++++++
  2 files changed, 28 insertions(+), 26 deletions(-)

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