termios overhaul (arbitrary baud rates) in rawhide glibc

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Thanks to H. Peter Anvin's efforts, with glibc-2.41.9000-20.fc43, we
finally expose the current termios interfaces to applications.  It only
took us nearly two decades after kernel support arrives.

* On Linux, the <termios.h> interface now supports arbitrary baud rates;
  speed_t is redefined to simply be the baud rate specified as an
  unsigned int, which matches the kernel interface.

Andreas Schwab found and fixed a missing header issue (openSUSE is good
at exposes those quickly), and things look okay now.

Given that compatibility symbols were needed for various
baud-rate-related functions (cfgetispeed, cfgetospeed, cfsetispeed,
cfsetospeed, cfsetspeed), there could be issues with FFI usage because
the newer definitions are unexpectedly used.

Thanks,
Florian

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