Fixes #20826 custom serial port speeds #21380
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Fixes mono#20826 by using linux' TCSETS2 ioctl instead of TIOCGSERIAL
some serial devices only support TCSETS2 ioctl and not TIOCGSERIAL ioctl
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Fixes #20826 custom serial port speeds by adding TCSETS2 ioctl support and falling back to the original TIOCGSERIAL
some serial ports support only one of these ioctl calls but not both