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llvm-mingw's static runtime (libc++, libmingwex, libc++abi, libunwind) references symbols the NT 5.2 export surface does not provide. Add a static library, linked into the Clang runtime chain below DLL_EXPORT_VERSION 0x601, providing: - C99 vsnprintf/snprintf on top of _vsnprintf/_vscprintf. - __imp_* aliases binding dllimport references to the static CRT definitions instead of ucrtbase import thunks, which collide with them (lld: "<sym> was replaced"). - K32EnumProcessModules, forwarded to psapi's EnumProcessModules. - The Win7 SRW lock and Vista condition variable surface, bound to the RTL implementation linked statically from rtl_vista. Modules get one self-contained, consistent synchronization implementation (ReactOS' lock layout is not Windows-compatible), no kernel32_vista.dll dependency, and stay runnable on any Windows version. Static SRW linking suggested by Timo Kreuzer. Address review feedback on the llvm-compat shims: sync_static.c now uses the proper SDK/NDK headers with WINAPI/NTAPI, imp_alias.h moved to sdk/include/reactos and fixes the msvcrtex slot decorations too, and a new InitOnceExecuteOnce shim lets us drop libkernel32_vista from the interface.