[0.85] Fix duplicate symbols with React.XCFramework

[cipolleschi]

Cherry-pick Request

Target Branch

0.85

Link to commit or PR to be picked

facebook/react-native@d21ffc9

Description

This fixes a duplicate symbol error when using React.XCFramework. The RCTSwiftUI.podspec was missing the podspec_sources function when setting up its source files, causing Xcode to both link with the XCFramework and compile the sources again — resulting in duplicate symbols and potential crashes.

This is a build-breaking issue for users consuming prebuilt XCFrameworks via CocoaPods, so it should be picked into 0.85.

[github-actions]

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[alanleedev]

@react-native-bot merge d21ffc9 0.85-stable

[react-native-bot]

✅ Successfully picked up your commit facebook/react-native@d21ffc9 on the branch https://github.com/facebook/react-native/commits/0.85-stable