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Fix TIOCGWINSZ type mismatch on DragonFly

Michael Neumann requested to merge mneumann/termion:fix-tiocgwinsz-dragonfly into master

Below is the error message I got before this patch:

error[E0308]: mismatched types
  --> src/sys/unix/size.rs:17:34
   |
17 |         cvt(ioctl(STDOUT_FILENO, TIOCGWINSZ, &mut size as *mut _))?;
   |                                  ^^^^^^^^^^ expected u64, found u32
help: you can cast an `u32` to `u64`, which will zero-extend the source value
   |
17 |         cvt(ioctl(STDOUT_FILENO, TIOCGWINSZ.into(), &mut size as *mut _))?;
   |                                  ^^^^^^^^^^^^^^^^^

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