Link Android libc++ explicitly

[sorinc03]

Summary

Fixes #9444.

This explicitly links c++_shared into both Android native targets so NDK 27 builds include -lc++_shared even when CMake leaves ANDROID_STL as an unconsumed cache variable.

Test plan

Ran the fabric example native debug build with the repo-configured NDK 27.1.12297006:

apps/fabric-example/android/gradlew -p apps/fabric-example/android :react-native-reanimated:externalNativeBuildDebug

The build completed successfully for react-native-worklets and react-native-reanimated across arm64-v8a, armeabi-v7a, x86, and x86_64. Generated Ninja files include -lc++_shared in both targets while CMakeCache.txt still shows ANDROID_STL:UNINITIALIZED=c++_shared, matching the issue scenario.

Also ran:

git diff --check

[Copilot]

Pull request overview

This PR fixes Android NDK 27.x linker failures by explicitly linking c++_shared in the native CMake targets for both react-native-worklets and react-native-reanimated, ensuring libc++ is linked even when ANDROID_STL is passed but not consumed by the NDK toolchain.

Changes:

• Link c++_shared explicitly in react-native-worklets Android CMake target.
• Link c++_shared explicitly in react-native-reanimated Android CMake target.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
packages/react-native-worklets/android/CMakeLists.txt	Adds c++_shared to worklets target link libraries to force libc++ shared linkage on NDK 27.
packages/react-native-reanimated/android/CMakeLists.txt	Adds c++_shared to reanimated target link libraries to force libc++ shared linkage on NDK 27.

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[sorinc03]

The two failing metadata checks look permission-related rather than code-related on this fork PR:

• github-pull-request-description-format failed with Resource not accessible by integration while trying to append PR body content. The PR body already contains the template HTML comment now.
• github-pull-request-label-format failed with Resource not accessible by integration while trying to add labels. I tried adding lib: Reanimated and lib: Worklets manually, but GitHub denied AddLabelsToLabelable for my account.

[tjzel]

Hi @sorinc03, thanks for the PR. The fix looks good to me but I don't understand one thing - why is the explicit linking statement required in our CMakeLists.txt but not in React Native's React Android? https://github.com/facebook/react-native/blob/main/packages/react-native/ReactAndroid/src/main/jni/CMakeLists.txt#L261-L271