- implemented SERIAL_GET_HANDFLOW ioctl
- made use of it in kernel.GetCommState

- implemented SERIAL_GET_LINE_CONTROL ioctl
- made use of it in kernel.GetCommState

- implemented SERIAL_GET_BAUD_RATE ioctl
- made use of it in kernel.GetCommState

- implemented ntdll's serial IOCTL SET_CHARS
- used this IOCTL in kernel32.SetCommState

- implemented ntdll's serial IOCTL SET_HANDFLOW
- used this IOCTL in kernel32.SetCommState

- implemented ntdll's serial IOCTL SET_LINE_CONTROL
- used this IOCTL in kernel32.SetCommState

- created dump_dcb to print out DCB information
- implemented ntdll's serial IOCTL SET_BAUD_RATE
- used this IOCTL in kernel32.SetCommState

Change the rhw=0 range to ]1e-8,1e-8[ and move the value to a constant
in wined3d_types.h

Print out more info on failed test.  Looks like there is a bug in ALSA
OSS emulation where it is returning a mid-sample position.

Use a more direct function to decode OIDs, instead of the bizarre
wrapper.