unix 2.7.2.0 * 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)