In Android 7, the AOSP-forked libunwind <https://tracker.debian.org/pkg/android-platform-external-libunwind> compiles against lib7z.so and its header files. Could you please provide separated packages for them?
The header files needed when building android-platform-external-libunwind includes: * 7zCrc.h * 7zTypes.h * Sha256.h * Xz.h * XzCrc64.h