The x86-64 kernels were written to the System V ABI only; on Windows's
different calling convention they silently read garbage args and ran in
near-constant time regardless of iteration count. Each public kernel now
gets a small ABI-translating thunk (WIN64_THUNK) on Windows so the kernel
bodies stay single-source. i386 also needed underscore-prefixed symbol
names to match Windows's cdecl convention. Verified end-to-end under Wine,
including determinism across repeated runs.
Also fixes CPU-core detection (sysconf isn't available under MinGW) and
adds memory/CPU-brand detection for the Windows system-info banner.
owen
72043eb956