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* Bundled with GHC 8.0.1
* Don't assume non-POSIX `WCOREDUMP(x)` macro exists
* Don't assume existence of `termios(3)` constants beyond `B38400`
* Don't assume existence of `ctermid(3)`/`tcdrain(3)`
* Change `drainOutput`'s `tcdrain(3)` into a `safe` FFI call
* Turn build error into compile warnings for exotic `struct stat`
  configurations (GHC #8859)
* Improve detection of `fdatasync(2)` (GHC #11137)
* Drop support for Hugs
* Drop support for Cygwin (and Windows in general)