Remove warning

[thiagopnts]

Remove warning from unused import

[hoppipolla-critic-bot]

Critic review: https://critic.hoppipolla.co.uk/r/4006

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[glennw]

@thiagopnts That import is required on Linux but not other platforms.

[Manishearth]

You can make it a separate import with #[cfg(target_os = "linux")] to kill the warning.

Alternatively, just place the import inside the function body where it is used (https://github.com/thiagopnts/servo/blob/remove-warnings/ports/glutin/window.rs#L513)

[thiagopnts]

@glennw @Manishearth I added the import on the function body!

[glennw]

Thanks! Can you squash these into one commit and then I'll merge it :)

[thiagopnts]

@glennw Done!