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eafd530d20kernel: avoid potential duplicate object in shared library/binary (Cory Fields)24c3b47010build: add kernel-specific warnings (Cory Fields) Pull request description: This is a revival of https://github.com/bitcoin/bitcoin/pull/31807 Introduces the [-Wunique-object-duplication](https://clang.llvm.org/docs/DiagnosticsReference.html#wunique-object-duplication) warning flag available in clang-21 for usage when building the kernel library. It warns of potential duplicate objects in shared libraries. REDUCE_EXPORTS needs to be ON to trigger it. Though we have a C API now that manages exporting symbols, I think it is prudent to also avoid any duplicate symbols on the internal c++ side in case we ever to decide to expose some of its headers. It also not clear that all linkers would handle these cases correctly even in the current internal usage. ACKs for top commit: fanquake: ACKeafd530d20hebasto: ACKeafd530d20. Tree-SHA512: 81961b50f0268dbe076497e130857f5b4b9151c748d107ec15158d1511dd25bce745e0beeb127b9cea51cb2edd78032735600606a75f7ff8a3fd572acced42e0