Common and basis_universal call zstd functions directly but never
declared the dependency after being split into their own
CMakeLists.txt files, relying on directory-scope include_directories()
that no longer reached them. Worked on Linux via system zstd.h, but
broke the Android NDK build which has no such fallback.
Co-Authored-By: Claude Sonnet 5 <[email protected]>
Claude-Session: https://claude.ai/code/session_01XMv4XdM5dThs9Avr5FPXRv