Noticed by Dan Armbrust.

- implemented ntdll's serial IOCTL: CLR_DTR, CLR_RTS, SET_DTR,
  SET_RTS, SET_XOFF, SET_XON, RESET_DEVICE
- implemented kernel32.EscapeCommFunction on top of them

- stubbed out ntdll's serial IOCTL SET_QUEUE_SIZE
- implemented kernel32.SetupComm on top of it

- implemented ntdll's COMM IOCTL GET_TIMEOUTS, SET_TIMEOUTS
- implemented kernel32.GetCommTimeout and SetCommTimeout on top of them

- implemented SERIAL_GET_CHARS ioctl
- made use of it in kernel32.GetCommState

- 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.