Don't define isIPad on simulator because it's unused and that causes a warning on llvm.
Don't define isIPad on simulator because it's unused and that causes a warning on llvm.

git-svn-id: b10e9e05a96f28f96949e4aa4212c55f640c8f96@2305 59b500cc-1b3d-0410-9834-0bbf25fbcc57

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