Don't bother to check for the Xi library, as its use is #if'd out in XIJoystick.cxx.
Don't bother to check for the Xi library, as its use is #if'd out in XIJoystick.cxx.

git-svn-id: c0942edff5350604e2827ab28bdfcfa5200fadee@20907 08b3d480-bf2c-0410-a26f-811ee3361c24

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