Fix libxcursor makefile

[Pe13]

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• This Pull Request doesn't contain any package additions; it's a small change (e.g README change)

Package Additions/Updates

• Have you confirmed this builds & works as intended on an iOS device (if applicable)?
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Extra Info

I just fixed a typo that blocked the build of the package, I checked that the package built for iphoneos-arm64-rootless 1800