SFML / SFML / 12175404127

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Fix segfault if XOpenIM fails

If `XOpenIM` fails we will store a `nullptr` into `sharedXIM`. When
the shared `XIM` is destroyed we call the deleter `XCloseIM` on the
`nullptr` which segfaults.

Fix this by adding a new `closeIM` helper function which checks for
null first.

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