Switch to static linking and migrate Windows CI to MinGW #7
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Simplify the build process by statically linking
libbitcoinkernelto produce more self-contained binaries with fewer moving parts. This requires migrating Windows CI from MSVC to MinGW/GCC:Previously, dynamic linking worked with MSVC because the C API provided a stable ABI boundary between compilers. However, static linking requires ABI compatibility between the library compiler and CGo's GCC toolchain on Windows, which MSVC does not provide. MinGW uses GCC, matching CGo's compiler and enabling static linking.